Treading Task Marine Corps Pfc. Michael Garziano holds a rubber rifle while treading water during a pool training event at Marine Corps Base Hawaii, Jan. 22, 2018. The event included various exercises such as an underwater swim, static breath holds and gear retrievals. Marine Corps photo by Lance Cpl. Luke Kuennen SHARE: Download: Full Size (0.63 MB) Credit: Lance Cpl. Luke Kuennen VIRIN: 180124-M-LK477-102C.JPG Photo Gallery