double agent

double-double wargame

double-tap strike / double tap strike

agent / agent network / agents

CW agent (chemical warfare agent)

obscurant agent (vision-restricting agent)

damage agent / damaging agent

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

double-entry passageway

single sap with double parapet

annular double-row ball bearing

cam and double roller

double-chamber gun

automatic double cycle revolver-type rifle

double back

double banking

double cone bearing

double cone clutch

double end wrench

double enveloping worm gear

double filament type headlamp

double fork lever