Photos

First Lt. Stephen Black, operations officer, Headquarters Detachment, Combat Logistics Battalion 15, 15th Marine Expeditionary Unit, works out on a stationary bike inside one of three fitness rooms aboard the USS Rushmore, Aug. 18. Marines from the MEU exercise regularly during the unit's final training evolution, Certification Exercise. CERTEX differs from previous exercises because Marines and Sailors react to unknown scenarios using the Marine Corps' Rapid Response Planning Process.