U.S. Marine Corps Sgt. Andrew Wundsam, a military working

U.S. Marine Corps Sgt. Andrew Wundsam, a military working dog handler, attached to Task Force San Francisco acts as an aggressor at the K-9 Heroes Bark in the Park event during San Francisco Fleet Week 2018, Oct. 6. During the event military and civilian canine heroes demonstrate search, rescue, and attack techniques. Military working dogs are used as a means to stop an aggressor without the use of deadly force.(U.S. Marine Corps photo by Lance Cpl. Johnson)