MAYPORT, Fla. (July 23, 2015) Sailors observe morning colors aboard the amphibious transport dock ship (USS New York LPD 21). President Obama issued a proclamation directing U.S. flags be lowered to half-staff on public buildings in honor of service members killed on July 16 by a gunman who opened fire at a military recruiting center and the Navy Operational Support Center in Chattanooga, Tenn. U.S. Navy photo by Mass Communication Specialist 1st Class John S. Smolinski/Released) 150723-N-UZ446-040 Star Spangled Flags