Foreign Legion vs US Army vs British Army — which is right for you?
Foreigners thinking seriously about military service compare these five forces most. The differences are not cosmetic — they decide whether you can enlist at all, how your family is treated, how long you commit, and what citizenship you walk out with.
The five forces at a glance
Pro force inside the French Armée de Terre, open to foreign men 17.5–39.5. Career legionnaires earn French residency, naturalization, and a CPCMR pension.
The US Army is large and well-equipped, with extensive benefits and post-service support, but is essentially closed to non-resident foreigners.
Open to UK nationals and certain Commonwealth applicants, but largely closed to other foreign nationals. Solid career structure, AFPS15 pension scheme.
The mainstream French Army. Foreign nationals cannot enlist directly — they must naturalize first, then apply, or enter via the Legion.
A Spanish Army light infantry brigade with its own traditions. Historically accepted foreign volunteers; today eligibility is much narrower — primarily Spanish citizens and some Latin American legal residents.
The full comparison, row by row
Any nationality male, 17.5–39.5. Medical, psych, physical, security at Aubagne. ~1 in 8 acceptance.
US citizens or lawful permanent residents (Green Card holders). Foreigners abroad cannot enlist; MAVNI program for specialized skills is mostly suspended.
UK, Irish, Commonwealth, and Gurkha applicants under defined rules. Most other foreign nationals cannot enlist.
French citizenship required. Foreigners are not accepted into regular Armée de Terre units — for foreigners, the door is the Legion.
Spanish citizens and limited categories of Latin American foreign nationals with legal residency. Not open to general international candidates as the French Legion is.
5 years initial (CEI). Renewable in blocks; full career possible.
Active duty enlistments typically 2, 3, 4, 5, or 6 years. Reserve and Guard contracts separately.
Open engagement — typically minimum 4 years served before discharge by purchase. Various technical contract structures.
Engagement Volontaire — typically 1, 3, 5, 8, or 10 years depending on path.
Spanish Army standard contract — typically 2-3 year tropa enlistments, renewable.
~€1,380/mo net Year 1. €1,500–€2,500+/mo with grade and specialty. ISSE €31–38/day on OPEX, tax-exempt.
E-1 ~$1,917/mo base + BAH + BAS. E-4 with dependents in higher-cost areas often $3,500–$5,000+ effective. Combat pay, family separation, and benefits add substantially.
Private (OR-2) starting salary ~£25,000/year per JSP 754. Rises with rank and seniority. LOA and operational allowances on deployment.
Soldat 2e classe ~€1,500–€1,700/mo gross. Sergent ~€2,200–€2,600/mo gross. Same grille indiciaire as Legion plus same OPEX premiums (ISSE).
Spanish Army pay scale — comparable order of magnitude to French regular army, with deployment supplements.
4 months at 4e RE Castelnaudary. Kepi blanc on completion. Specialty courses after assignment to regiment.
Basic Combat Training 10 weeks, followed by AIT (military occupational specialty training) varying by MOS.
14-week Phase 1 (CIC Catterick for infantry, ATC Pirbright for others). Phase 2 trade-specific training.
4-month Formation Générale Initiale (FGI) at a regimental training centre. Then specialty training.
Spanish Army basic training, then Legion regimental traditions and specialty.
Path to French citizenship: 3 years honorable service, or "français par le sang versé" if wounded in service. French residency on honorable discharge.
Accelerated naturalization for service members under INA Section 329 — citizenship typically available after 1 year of honorable service.
UK service can support an application for naturalization but is not an automatic path. Commonwealth soldiers historically faced complex immigration outcomes — reformed in recent years.
Already required — this is the regular army for French citizens.
Spanish military service can support an application for Spanish naturalization but is not an automatic short path for non-Hispanic foreigners.
No family permitted during first 5-year contract. Marriage requires command authorization. Family allowed after re-engagement.
Family welcome from day one (post-training). On-base housing (BAH if off-base), TRICARE healthcare, commissary, exchange.
Family permitted; Service Family Accommodation (SFA) or Single Living Accommodation (SLA). Healthcare via Defence Medical Services.
Permitted; military housing (logements domaniaux) via IGESA. Healthcare via SSA.
Standard Spanish military family rules.
Active. Sahel, Levant, jungle in French Guiana, Mayotte. Casualties documented. 2e REP and GCP deploy heavily.
Active globally — recent decades: Iraq, Afghanistan, ongoing rotational deployments.
Reduced from peak operations, but standing rotations to Estonia (eFP), Cyprus, Falklands, Brunei, plus short-notice contingencies.
Same operational tempo as the Legion — units deploy to Sahel, Levant, NATO eFP, Indo-Pacific, French Guiana.
Spanish operations including BLI deployments, NATO assignments.
No French required at start. Taught by immersion during 4-month training. Fluent by ~12 months.
English required.
English required.
French required.
Spanish required.
CPCMR — 1/60th of base pay per year. 15 years = ~25% immediate pension, indexed, for life.
Blended Retirement System (BRS) for those joining after 1 Jan 2018: TSP contributions + reduced 2% × years × high-3 pension after 20 years.
AFPS15 — career average revalued earnings (CARE) scheme. Early Departure Payment (EDP) at 40 with 20 years service.
CPCMR — identical to Legion. 1/60th per year, 75% cap.
Spanish military pension system.
Foreigners with no other route into a major NATO military. Those who want a clean break and a new identity option. Career soldiers seeking French citizenship.
US citizens and qualified residents seeking comprehensive benefits, family support, and a clear long career path.
UK nationals and eligible Commonwealth applicants. Often not an option for the typical American, Eastern European, or third-country candidate.
French citizens. For non-Français, naturalization via the Legion is the documented pathway in.
Spanish-speaking candidates with the right nationality basis. Do not confuse with the French Foreign Legion — the doors are different.
The bottom line — which one fits you?
The US Army gives you the most benefits, the strongest family support, and the most comprehensive career path. The Legion offers a different kind of experience — but you would be choosing it for reasons other than pay or material support. US service is documented to be unambiguous for your home-country status.
The British Army is generally the better fit — pay, family welfare, and AFPS15 pension structure are designed for you. Legion makes sense only if British eligibility is closed to you or you have specific reasons for leaving the UK.
The Foreign Legion is, for many, the only major European military that will accept you. Eastern Europeans, Latin Americans, Africans of allied nations, ex-military from non-NATO states, civilians from anywhere — the Legion door is open if you are 17.5–39.5, fit, and clean enough on background.
Regular Armée de Terre keeps you closer to home and lets your family normalize faster. Legion offers a faster operational tempo, stronger esprit de corps, more elite-unit options (2e REP, GCP), and often more demanding standards. Many French choose Legion for exactly those reasons, knowing it costs them in family stability during the first contract.
Verify your eligibility carefully — the Spanish Legion is not a parallel of the French Foreign Legion in openness to foreign candidates. Spanish citizenship or specific Latin American legal residency is the door. Do not assume the name guarantees the same access.
- —This comparison is based on public sources. Specific eligibility, pay tables, and benefits change. Verify with each service's official recruiter before making any decision.
- —Some countries treat foreign military service as expatriating or as triggering legal restrictions. Consult a qualified attorney in your home country before enlisting in any foreign military.
- —Pay figures here are published baselines. Actual take-home varies with cost-of-living allowances, dependants, deployments, and tax residency.
- —The Foreign Legion is male-only. The US, UK, and French regular armies enlist both men and women.
- — legion-etrangere.com / legionrecrute.com — French Foreign Legion (eligibility, contracts).
- — defense.gouv.fr — French Ministry of the Armed Forces.
- — Code des pensions civiles et militaires de retraite (CPCMR), legifrance.gouv.fr.
- — Décret n° 2012-1520 — ISSE OPEX pay.
- — army.mil and dfas.mil — US Army pay and benefits.
- — army.mod.uk and JSP 754 — British Army pay structure.
- — ejercito.defensa.gob.es — Spanish Army / Spanish Legion.
- — INA Section 329 (US Code) — military naturalization.