The US-Philippines Military Alliance — What the Briefing Won't Cover
For US service members deploying to Balikatan, JCET, or EDCA base locations. What EDCA actually means. How the AFP is organized. What the alliance does operationally. And the context your pre-deployment brief will gloss over.
The US-Philippines alliance is one of America's oldest treaty alliances in the Pacific — the Mutual Defense Treaty has been in force since 1951. The relationship went cold after the 1992 base closures and went sideways under the Duterte administration. Under Marcos Jr. (from 2022 onward), it is back and expanding fast, driven almost entirely by shared concern about Chinese maritime activity in the West Philippine Sea. The AFP is a combat-experienced force fighting active insurgencies. They are also warm, professional hosts who take bayanihan — the Filipino concept of collective solidarity — seriously in their unit culture. Go in prepared. Go in respectful. They will meet you there.
EDCA — What It Actually Means
Enhanced Defense Cooperation Agreement, 2014 — expanded 2023
The EDCA was signed in 2014 under President Aquino and given a clean constitutional review by the Philippine Supreme Court in 2016. It gives the United States prepositioned access to designated areas within Philippine military installations. It does not establish new US bases. It does not transfer sovereignty. This distinction is not a technicality — it is the entire legal and political foundation of the agreement.
The Philippine Constitution prohibits foreign military bases on Philippine territory without a treaty ratified by the Senate. EDCA is structured as an executive agreement under the existing Mutual Defense Treaty (MDT, 1951) and Visiting Forces Agreement (VFA, 1998), which avoids that constitutional requirement. Philippine legal scholars and courts have examined this structure and upheld it — but the political tension over foreign military presence in the Philippines is real and persistent. When you are at an EDCA site, you are at a Philippine installation. That framing is not diplomatic courtesy. It is the legal reality.
In April 2023, the Marcos Jr. administration announced four new EDCA sites, bringing the total to nine agreed locations (though operational development varies by site). The four new sites were selected with obvious geographic logic: northern Luzon (facing Taiwan), and Palawan (facing the West Philippine Sea). US officials described the expansion as driven by humanitarian disaster response needs — a characterization that is accurate and simultaneously incomplete. The strategic positioning relative to the South China Sea / Taiwan contingency planning is publicly discussed in defense analysis; you should understand it.
Source: Philippine DND official announcements, US Embassy Manila press releases. Sites and operational status evolve — verify current access arrangements with your command prior to deployment. EDCA text is publicly available through the Philippine Official Gazette.
The AFP — Branch Structure and What It Means For You
Know your counterpart before you arrive
The Armed Forces of the Philippines is smaller than it looks on a map. Active duty strength is approximately 125,000 personnel across all branches, with a much larger reserve force. The AFP punches above its weight in COIN and jungle operations because it has been doing it continuously for decades. What it lacks is the logistics tail, ISR depth, and long-range strike capability that the US brings to the bilateral exercises. The exercises are genuinely complementary — they are not the AFP doing US Army drills while Americans watch.
Philippine Army (PA)
Ground combat, COIN, internal securityLargest branch. Primary mission includes counterinsurgency operations in Mindanao against NPA, ASG, and BIFF remnants. Also responsible for territorial defense. Scout Rangers (RRAA) are the Army's elite light infantry regiment. 1st Special Forces Regiment (Airborne) is the Army SF element under AFSOC.
Philippine Navy (PN) + Philippine Marine Corps (PMC)
Maritime security, West Philippine Sea, amphibious opsThe PN has received significant modernization investment tied to the West Philippine Sea mission. The Philippine Marine Corps is the PN's ground combat arm — a distinction from US organizational structure. For US Marines working in the Philippines, your primary AFP partner is likely the PMC. The Navy's growing surface fleet and maritime patrol capability are central to the alliance's maritime security cooperation.
Philippine Air Force (PAF)
Air defense, close air support, maritime patrolThe PAF operates South Korean-built FA-50 light combat aircraft, S-211 trainers, and a mix of rotary-wing assets. The PAF has been the primary AFP beneficiary of the EDCA sites given the base access model. Air-to-air capability has been historically limited — the PAF has been primarily focused on CAS and maritime patrol rather than air superiority.
AFP Special Operations Command (AFSOC)
Joint SOF, counterterrorism, engagement with US SOCOMThe joint special operations command for the AFP. Contains elements from all three service branches. The primary AFP counterpart for US SOCOM engagements including JCET. AFP AFSOC works with US Special Forces (SFAB and SF Groups), MARSOC, and SEAL elements on the regular engagement calendar.
Note on the PMC: US Marines working alongside the Philippine Marine Corps should know that the PMC is organizationally part of the Philippine Navy, not a separate service. The PMC has its own proud identity and combat history — including significant roles in Mindanao — but chain of command runs through the PN, not independently. This creates some interesting dynamics in combined exercises where USMC and PMC work together within a broader Navy-to-Navy framework.
Balikatan — The Alliance's Flagship Exercise
Annual bilateral exercise — US and Philippines. Shoulder to shoulder.
Balikatan translates to “shoulder to shoulder” in Filipino — an intentional naming choice that reflects the bilateral nature of the exercise. It is not a US-led training event with Philippine observers. Both militaries plan, execute, and lead components. That said, the US typically brings the larger logistics and ISR footprint, and the exercise scenarios have evolved to reflect real-world contingencies in the West Philippine Sea and Mindanao rather than generic combined-arms scenarios.
Balikatan 2023 and Balikatan 2024 were notably expanded under the Marcos Jr. administration — both in scale (personnel numbers) and in scenario scope, including a live-fire maritime strike event in 2023 that represented a new level of alliance integration. Australian forces participated in Balikatan 2024 as an invited partner, signaling the exercise's growing multilateral dimension.
- +Combined arms live-fire at AFP ranges
- +Amphibious operations with Philippine Navy and PMC
- +Close air support integration with PAF
- +HADR exercises in realistic Philippine terrain
- +Logistics coordination at EDCA and AFP base locations
- +Special operations integration with AFP AFSOC
- +Read the VFA — jurisdiction rules apply the moment you land
- +Climate is tropical; heat acclimatization before arrival is real mission prep
- +Cultural briefing is not optional — it will affect your working relationships
- +AFP counterparts will be your peers, not your students
- +English is widely spoken in AFP; Tagalog/Filipino basics are relationship-builders
- +Food on base will be good; be a respectful guest at the AFP mess
What the Alliance Actually Does
Four operational pillars you need to understand
Maritime Security — West Philippine Sea
The primary strategic driver of the alliance in 2024-2026. US and AFP maritime cooperation includes combined patrols, intelligence sharing, and logistics support for AFP resupply missions to Philippine-occupied features in the Spratly Islands. The Mutual Defense Treaty's applicability to maritime incidents is the central deterrence question — senior US officials have repeatedly affirmed it applies to armed attacks on Philippine public vessels.
Counterterrorism — Mindanao
The longest-running US-AFP cooperation mission. Since the post-9/11 Joint Special Operations Task Force-Philippines (JSOTF-P, now JTF-Philippines), US SOCOM has maintained a persistent engagement in Mindanao. The primary AFP partners are Scout Rangers and AFSOC elements. The threat environment in Mindanao has evolved — Abu Sayyaf Group (ASG) and Bangsamoro Islamic Freedom Fighters (BIFF) remain active, though the 2014 Bangsamoro peace process with the MILF (Moro Islamic Liberation Front) has reduced the primary insurgency.
Humanitarian Assistance / Disaster Relief (HADR)
The Philippines is in the Pacific typhoon belt and the Pacific Ring of Fire. HADR cooperation is not a contingency — it is a regular mission. Typhoon Haiyan (Yolanda) in 2013 was the largest US military HADR response in the alliance's history. AFP and US forces have practiced and executed HADR together repeatedly. If you deploy to the Philippines for any extended period, understand the HADR mission — it may activate without notice.
Intelligence, Surveillance, and Reconnaissance (ISR)
The US provides ISR support to AFP operations in both the Mindanao and maritime domains. This is less publicly discussed than exercise cooperation but is central to the practical partnership. US ISR assets — including maritime patrol aircraft — operate from EDCA sites and from platforms at sea. The intelligence-sharing architecture under the bilateral relationship supports AFP situational awareness in areas where AFP organic ISR is limited.
JCET — SOF Engagement with AFP
Joint Combined Exchange Training — the quiet bilateral
JCET engagements in the Philippines are among the most operationally relevant in the Pacific SOCOM calendar. The AFP Special Forces — particularly the 1st Special Forces Regiment (Airborne) of the Philippine Army and AFP AFSOC elements — have real-world experience in jungle, urban, and counterterrorism operations from continuous Mindanao deployments. They are not a force that needs basic instruction. JCET engagements here are genuinely bilateral exchanges of TTPs, not one-way training.
The Joint US Military Assistance Group Philippines (JUSMAG-Philippines) is the standing bilateral security cooperation organization that coordinates the JCET calendar, among other functions. It is based in Metro Manila. If you are working a JCET, your chain of command runs through SOCPAC with coordination through JUSMAG-Philippines.
The VFA's jurisdiction framework applies to all US service members in the Philippines under bilateral exercises and training events — including JCET. The VFA provides some protections but does not give US forces immunity. Read the VFA/SOFA guide before you deploy.
The Alliance in Philippine Political Context
Context you need to be aware of — even if it's above your pay grade
The US-Philippines alliance has a complicated history that your AFP counterparts are well aware of, even if they do not mention it in the first briefing. The Philippines was a US colony from 1898 to 1946. The bases at Clark and Subic were negotiated out in 1992 after the Philippine Senate rejected the basing treaty — a nationalist assertion of sovereignty that remains a source of genuine pride. Rodrigo Duterte publicly and repeatedly questioned the alliance during his administration (2016-2022) and suspended the VFA in 2020, creating real operational uncertainty.
Under Ferdinand Marcos Jr., the relationship has been reset to historically warm levels — driven by the shared concern about Chinese maritime activity. This political dynamic is not stable in the long run; Philippine domestic politics and electoral cycles will continue to shape the alliance. That is not your problem to solve as a service member on a Balikatan rotation, but understanding that your AFP counterparts are navigating internal political pressures about the alliance helps explain why some conversations about basing, jurisdiction, and alliance scope will be handled with diplomatic care.
The bottom line: the Filipinos who join the AFP and work with US forces are, on balance, genuinely pro-alliance. They have seen what the alternative looks like. Be a good guest. Represent your service well. The relationship has survived far worse than any individual service member could break — but a good impression compounds over time.
Common Questions
Does the US have military bases in the Philippines?
No — and the distinction matters. The Enhanced Defense Cooperation Agreement (EDCA) gives the United States access to designated areas within Philippine military installations. These are Philippine bases that US forces can access under a bilateral agreement, not US sovereign bases like Guam or Okinawa. The 1992 US withdrawal from Clark Air Base and Subic Bay Naval Station closed the permanent US base presence. The current arrangement is deliberately structured to respect Philippine constitutional restrictions on foreign military bases. When you arrive at an EDCA site, you are a guest on a Philippine installation. That framing is not just legal — it shapes how your AFP counterparts think about the relationship.
What is Balikatan and who participates?
Balikatan ("Shoulder to Shoulder" in Filipino) is the annual bilateral exercise between US and Philippine military forces. It is the flagship exercise of the alliance and the largest bilateral military exercise in the Philippines. US forces from multiple services participate — Army, Marine Corps, Navy, and Air Force components. The AFP participates across all its branches: Philippine Army, Philippine Navy (including Philippine Marine Corps), and Philippine Air Force. The exercise has grown significantly under the Marcos Jr. administration, with Balikatan 2024 involving over 16,000 personnel from both militaries plus observers from allied nations. If you are assigned to Balikatan, you will work alongside AFP counterparts in your functional area.
What is the AFP command structure I need to know?
The Armed Forces of the Philippines is organized under a Chief of Staff (AFP CSAFP), with three major service components: Philippine Army (PA), Philippine Navy (PN) — which includes the Philippine Marine Corps (PMC) as its ground combat element — and Philippine Air Force (PAF). The AFP also has the Armed Forces of the Philippines Special Operations Command (AFSOC), which is the joint special operations headquarters that works closely with US SOCOM. For most Balikatan rotations and JCET engagements, you will work with a specific AFP branch counterpart. Know your AFP counterpart's branch before you arrive — it affects how they are organized, how they communicate, and what their operational focus is.
What are the EDCA locations officially announced?
The Philippines announced four new EDCA sites in April 2023, adding to three existing sites. The 2023-announced locations include: Cagayan Province (two sites — near Laoag and NAS Lal-lo), Isabela Province (Camp Melchor Dela Cruz), and Palawan Province (Camp Ranido). These sites face the South China Sea to the north and west and are assessed publicly as relevant to potential maritime contingencies. The three pre-2023 sites include Antonio Bautista Air Base (Palawan), Basa Air Base (Pampanga), and Lumbia Air Base (Cagayan de Oro area). US forces access these sites under EDCA terms — the AFP retains command of each installation.
What is JCET and how does it differ from Balikatan?
Joint Combined Exchange Training (JCET) is a Title 10 authority that allows US Special Operations Forces to train with foreign military units. In the Philippines, JCET engagements typically involve US SOCOM elements — primarily Special Forces Groups — working alongside AFP Special Forces units under AFSOC. Unlike Balikatan (which is a large-scale annual bilateral exercise), JCETs are smaller, more frequent, and focused on building specific capabilities in AFP special operations forces. The stated purpose of JCET is US force training — the skill-transfer to the AFP partner unit is a secondary benefit under the legal authority. In practice, both sides get trained. If you are in a SOCOM unit, JCETs in the Philippines are part of the regular engagement calendar.
What is the West Philippine Sea and why does it matter for this alliance?
The West Philippine Sea is the Philippine government's official designation for the portions of the South China Sea within the Philippines' Exclusive Economic Zone. It is the center of the primary external security challenge facing the alliance. China's expansive maritime claims, island-building, and coast guard activities in the area have brought the US-Philippines alliance to one of its most active periods since the Cold War. The 2016 UNCLOS arbitration ruling, which invalidated China's nine-dash line claims, was ignored by Beijing but remains the legal foundation of the Philippine position. As a US service member in the Philippines, you will hear about Second Thomas Shoal (Ayungin Shoal in Filipino), Scarborough Shoal, and the Spratly Islands constantly. Understand what they are before you arrive.
- • EDCA full text — Philippine Official Gazette: officialgazette.gov.ph
- • Philippine Department of National Defense (DND) — EDCA site announcements: dnd.gov.ph
- • US Embassy Manila — EDCA and alliance press releases: ph.usembassy.gov
- • Balikatan official information — US Indo-Pacific Command: pacom.mil / indopacom.mil
- • Armed Forces of the Philippines official public affairs: afp.mil.ph
- • Mutual Defense Treaty (MDT, 1951) — text available through the US State Department Treaty Database
- • Philippine Supreme Court decision on EDCA constitutionality (2016) — G.R. No. 212426
This guide reflects publicly available information as of June 2026. Alliance structure, EDCA site operational status, and exercise schedules change. Verify current details with your command and the relevant country team. This is not legal advice and does not reflect classified information.
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