Ensign Frank S. Sysko assigned to Naval Mobile Construction Battalion THREE holds his breath while he exits a mud-filled trench during a jungle warfare training evolution

From the U.S. Department of Defense (DOD):

Ensign Frank S. Sysko assigned to Naval Mobile Construction Battalion THREE holds his breath while he exits a mud-filled trench during a jungle warfare training evolution hosted by the U.S. Marine Corps. NMCB 3 is deployed to several countries in the U.S. Pacific Command area of operations conducting construction operations and humanitarian assistance projects. 

U.S. Navy photo by Mass Communication Specialist 1st Class Michael Gomez