foreign
The country has twice been occupied by foreign militaries.

national
all-volunteer, professional, regular, volunteer
powerful, strong
large
modern
uniformed
active, active-duty

serve in
I wasn't surprised to learn that he'd served in the military.

enter, join
Coghlan joined the military and served in the war.

leave
He left the military in 1993 and became a security guard.

call in
The government called in the military to deal with the riots.

train
deploy
build
maintain
The country maintains a strong military purely for defence/defense.

modernize, reform, transform
efforts to transform the military into a 21st-century fighting force

strengthen
defeat

fight
operate
seize power, take power
kill sb

among the military, in the military, within the military
reports of growing discontent among the military

a member of the military

Military is used with these nouns:
academy, action, activity, administration, advantage, adventure, adviser, affair, aggression, aid, aircraft, airport, alignment, alliance, analyst, aspect, assault, asset, assistance, authority, background, balance, band, barracks, base, bloc, blockade, budget, build-up, cadet, camp, campaign, capability, career, cargo, casualty, cemetery, censorship, character, checkpoint, chief, college, command, commander, commitment, complex, compound, conflict, confrontation, conquest, conscription, contingent, contract, contractor, control, convoy, cooperation, coup, court, crackdown, credentials, custody, decoration, defeat, delegation, deployment, detention, dictatorship, disaster, discipline, district, doctor, doctrine, dominance, domination, draft, dress, duty, education, effectiveness, elite, emergency, equipment, escalation, escort, establishment, exercise, expansion, expedition, expenditure, expert, exploit, facility, faction, failure, family, fatigue, flight, force, formation, funeral, gain, genius, glory, government, governor, guard, haircut, hardware, headquarters, helicopter, hero, hierarchy, historian, history, honour, hospital, importance, institution, intelligence, intervention, invasion, involvement, jargon, jet, junta, lawyer, leader, leadership, liaison, link, machine, manoeuvre, manpower, march, means, member, mission, move, museum, necessity, objective, observer, occupation, offensive, officer, official, operation, parade, patrol, personnel, pilot, planning, point of view, police, policeman, position, posture, power, precision, preparation, presence, president, prison, prowess, readiness, rebellion, reconnaissance, record, recruit, recruitment, regime, representative, repression, reprisal, research, resistance, retaliation, roadblock, role, rule, ruler, salute, sanction, satellite, school, secret, service, setback, ship, showdown, siege, situation, skill, slang, solution, source, spending, sphere, standpoint, strategy, strength, strike, success, superior, superiority, supply, support, supremacy, surveillance, tactic, takeover, target, technology, thinking, threat, tradition, training, transport, tribunal, triumph, truck, uniform, unit, uprising, utility, vehicle, veteran, victory, wing, withdrawal, zone