Jungle Warfare Training U.S. Navy Petty Officer 1st Class Joshua W. Karr takes a moment to collect himself after crawling through a mud-filled trench during jungle warfare training on Okinawa, Japan, Jan. 12, 2016. U.S. Marines with the Jungle Warfare Training Center hosted the event. Karr is a construction mechanic assigned to Naval Mobile Construction Battalion 3. U.S. Navy photo by Petty Officer 1st Class Michael Gomez SHARE IMAGE: Download Image: Full Size (1.54 MB) Tags: Naval Mobile Construction Battalion 3, Lead Photos, All images, Japan, U.S. Navy, Sailor, Okinawa, Navy Photo By: Petty Officer 1st Class Michael Gomez VIRIN: 160112-D-HV319-153.JPG Photo Gallery