back action

back-to-back circuit

back-to-back connection

back-to-back radio stations

back-to-back relay

blow-back 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

back-up fire control

back-up system

cut back co-operation

I read back

play back kit

pull back

push back

read back

reverse engineering ( back- wards engineering)

Camel-back water pouch

Field Pack, Air Support Back

back brief / backbrief

peel back

back on the block

back-up circuit breaker

armor back plate

back bearing housing

back blow

back contact

back cushion

back fork

back gun

back impact