Do fighter pilots have to wear oxygen masks the entire time they fly, or can they take off their masks? - Quora
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Goggles, oxygen mask, and helmet worn by B-17 pilot Capt William Rector > National Museum of the United States Air Force™ > Display
![File:US Navy 050623-N-1332Y-128 Commander, U.S. Seventh Fleet, Vice Adm. Jonathan W. Greenert, dons an oxygen mask and pilot's helmet as he prepares for a flight in an F-A-18F Super Hornet.jpg - Wikimedia File:US Navy 050623-N-1332Y-128 Commander, U.S. Seventh Fleet, Vice Adm. Jonathan W. Greenert, dons an oxygen mask and pilot's helmet as he prepares for a flight in an F-A-18F Super Hornet.jpg - Wikimedia](https://upload.wikimedia.org/wikipedia/commons/1/1c/US_Navy_050623-N-1332Y-128_Commander%2C_U.S._Seventh_Fleet%2C_Vice_Adm._Jonathan_W._Greenert%2C_dons_an_oxygen_mask_and_pilot%27s_helmet_as_he_prepares_for_a_flight_in_an_F-A-18F_Super_Hornet.jpg)