Actors with Marine Corps Band New Orleans, wear period piece costumes to represent important historical points in Marine Corps Reserve history at the Ponce La Perla Theater during a concert to celebrate the Marine Corps Reserve Centennial in Puerto Rico on Oct. 17, 2016. Marine Forces Reserve is commemorating 100 years of rich history, heritage, espirit-de-corps across the U.S. The Centennial celebration recognizes the Reserve's essential role as a crisis response force and expeditionary force in readiness, constantly preparing to augment the active component. (U.S. Marine photo by LCpl. Ricardo Davila/ Released)