double-action revolver

automatic double cycle revolver-type rifle

single-action revolver

hinge-action revolver

double-double wargame

double-tap strike / double tap strike

revolver

cap and ball revolver

cylinder axis (of a revolver)

revolver gun

hinged frame-type revolver

double-action

double-action fuze

double-action only

double-action pull

double-action trigger system

double-pull trigger action

after-action review / after action review (AAR)

integrated mine action and development (linking mine action and development)

follow-up on corrective action / following on corrective action

tension release action mine / tension-release action mine

double apron fence

double bottom

double bottom space

double concertina fence

double envelopment

double hull

double-apron fence

double consistent fire concentration

double magazine pouch, triple mag pouch

composite-modified double-base propellant

double staggered column

double crossover