secondary control officer

field officer (field-grade officer / senior officer)

secondary system of fire control

secondary control surfaces

non-commissioned officer (NCO) / noncomissioned officer

secondary blast effect

secondary burn

secondary dogwatch

secondary effect of blast wave

secondary fire sector

secondary high explosive

secondary injuries

secondary item

secondary landing

secondary magazine

secondary military occupational specialty (MOS)

secondary objective / target

secondary port

secondary task

secondary water terminal

secondary sector of fire

secondary fragmentation

buddy secondary life support system

secondary frame

secondary defect

additional secondary factor (ASF)

secondary alteration

secondary cyclone

secondary depression

secondary radar

secondary rainbow

secondary runway

secondary station