Coast Guard Lt. Matthew Brinkley, commanding officer of the Coast Guard Cutter Mustang, briefs members of his crew before deploying a boarding team to provide security for President Barack Obama in Seward, Alaska, Sept. 1, 2015. The crew of the Mustang and Maritime Safety and Security Team Honolulu provided a security zone for Obama as the the president viewed glaciers from the charter vessel Viewfinder. (U.S. Coast Guard photo by Petty Officer 1st Class Shawn Eggert)