breathing system

breathing-oxygen system

air-breathing jet engine

breathing control

scuba (Self-Contained Underwater Breathing Apparatus)

self-contained breathing apparatus (SCBA)

engine breathing ability

hose breathing apparatus

hose breathing device

CABCDE (Critical Bleeding, Airway, Breathing, Circulation, Disability, Exposure)

terrain-hugging air-breathing low-flying vehicles

fresh-air hose breathing apparatus

air breathing engine

compressorless air-breathing jet engine

ram air-breathing jet engine

oxygen-breathing apparatus

autonomous breathing apparatus

breathing oxygen

self-contained open-circuit breathing apparatus

air breathing defense

air breathing missile

air breathing target

Emergency Escape Breathing Device (EEBD)

fire extinguishing system sprinkler system and fire alarm system

merchant ship communication system (mercomm system)

multiple launch rocket system (MLRS); multiple rocket launcher system

Air Force weapons system / AF weapon system

attitude-and-heading reference system / attitude and heading reference system (AHRS)

selective calling system, SELCAL system

Unmanned Aerial System / Uncrewed Aircraf System (UAS)

system of system common operating environment

active denial system

active infrared (IR) guidance system