Chickenshit refers to behavior that makes military life worse than it need be: petty harassment of the weak by the strong; open scrimmage for power and authority and prestige; sadism thinly disguised as necessary discipline; a constant 'paying off of old scores'; and insistence on the letter rather than the spirit of ordinances.
Paul FussellTo get home you had to end the war. To end the war was the reason you fought it. The only reason.
Paul Fussell