Marine Corps Lance Cpl. John Sandherr prepares to release Lotor, a military working dog, to demonstrate a controlled aggression technique at Duboce Park during Fleet Week San Francisco, Oct. 6, 2017. Sandherr is assigned to 1st Marine Expeditionary Force. Fleet week provides an opportunity for the American public to meet Navy, Marine Corps, and Coast Guard service members and to experience America's sea services. Fleet Week San Francisco highlighted naval personnel, equipment, technology, and capabilities, with an emphasis on humanitarian assistance and disaster response. Navy photo by Seaman Natalie Byers