As a bombardier Yossarian is “the best man in the group at evasive action.”
It was a different type of plane, a European-built ATR-72 (the bombardier is a Canadian plane).
Neither, staring through his bombsight, could bombardier Umphress.
1550s, soldier with a bombard, from French bombardier, from bombard (see bombard (n.)). In 17c.-18c. of soldiers who manned artillery (especially mortars and howitzers); meaning "one who aims the bombs in an aircraft" is attested 1932, American English.