Underwater Exhalation Marine Corps 2nd Lt. Brandon J. Klewicki uses an emergency breathing system during helicopter underwater egress training at the base pool at Marine Corps Base Hawaii, March 23, 2017. Marine Corps photo by Cpl. Aaron S. Patterson SHARE: Download: Full Size (2.4 MB) Credit: Cpl. Aaron Patterson VIRIN: 170323-M-QH615-137A.JPG Photo Gallery