MARINE CORPS AIR STATION YUMA, Ariz. -- U.S. Marine Corps Military Working Dog (MWD) Ken with the Provost Marshall's Office, K9 Section, Headquarters and Headquarters Squadron, Marine Corps Air Station (MCAS) Yuma, poses for a silhouette photograph on MCAS Yuma, Jan. 18, 2019. MWD's are trained to subdue or intimidate suspects before having to use lethal force; they are also used for detecting explosives, narcotics, and other harmful materials. (U.S. Marine Corps photo by Sgt. Allison Lotz)