Oklahoma Army National Guard Spcs. Matthew Rumbo, left, and Jonathan Salazar conduct amphibious operations training at Lake Elmer Thomas at Fort Sill, Okla., June 1, 2015. The soldiers are assigned to the 1st Battalion, 180th Cavalry Squadron, 45th Infantry Brigade Combat Team. Oklahoma Army National Guard Spcs. Matthew Rumbo, left, and Jonathan Salazar conduct amphibious operations training at Lake Elmer Thomas at Fort Sill, Okla., June 1, 2015. The soldiers are assigned to the 1st Battalion, 180th Cavalry Squadron, 45th Infantry Brigade Combat Team. SHARE: Download: Full Size (2.14 MB) Tags: Photo Essays Credit: VIRIN: 478321-P-OSO73-788.jpg Photo Gallery