Jack, a military working dog, barks under the leash of U.S. Marine Corps Cpl. Ivan Perez, a military working dog handler with Provost Marshal's Office, Marine Corps Base Camp Smedley D. Butler, on Camp Hansen, Okinawa, Japan, May 26, 2022. Perez and Jack, an 80-pound German Shepherd, specializing in explosives detection, have trained together for nearly a year. PMO K-9 teams are on continuous shifts on all bases in Okinawa, trained and prepared for emergencies such as suspect apprehension, pursuit attacks, building searches, field scouting, drug, and explosives detection. (U.S. Marine Corps photo by Cpl. Alex Fairchild) - Jack, a military working dog, barks under the leash of U.S. Marine Corps Cpl. Ivan Perez, a military working dog handler with Provost Marshal's Office, Marine Corps Base Camp Smedley D. Butler, on Camp Hansen, Okinawa, Japan, May 26, 2022. Perez and Jack, an 80-pound German Shepherd, specializing in explosives detection, have trained together for nearly a year. PMO K-9 teams are on continuous shifts on all bases in Okinawa, trained and prepared for emergencies such as suspect apprehension, pursuit attacks, building searches, field scouting, drug, and explosives detection. (U.S. Marine Corps photo by Cpl. Alex Fairchild)