- abatised
- abatis
- about-face
- accoutrement
- activate
- active
- action
- adjutancy
- adjustment
- adjutant
- advance-guard
- affair
- afield
- air commodore
- air force
- air umbrella
- air power
- air-base
- air-borne
- air-defence
- air-unit
- aircraftman
- allotment
- aid station
- aide
- air-marshal
- alarm-post
- allot
- allowance
- amphibious
- antiaircrafter
- annoy
- amphibian
- anti-missile
- anti-personnel
- ante-room
- antimissile
- antipersonnel
- approach
- appui
- archie
- archibald
- artificer
- artilleryman
- assume
- astride
- armature
- armour-piercing
- army-list
- arrange
- array
- armour-piercer
- armoured
- army-beef
- assembly
- artillerist
- ashcan
- armour
- artillery
- ash can
- attention
- awol
- avenue
- baggage
- bail
- ball-cartridge
- ballista
- ballistic
- ballistic missile
- ballistician
- ballistics
- basis
- bat
- beach-master
- banquette
- baptism
- barrack
- beat
- barrage
- bases
- batter
- battalion
- battery
- bay
- bazooka
- beach-head
- bead
- beef
- beeves
- besiege
- big gun
- billet
- bivouac
- blockhouse
- blighty
- blind
- blindage
- blinker
- blitz
- booby trap