Marines with 8th Communication Battalion utilize the approved swimming strokes during the 250-meter portion of their annual intermediate swim qualification aboard Marine Corps Base Camp Lejeune, N.C., March 4, 2015. A swim qualification every two years is a requirement for all able-bodied Marines to ensure mission readiness and to uphold the basic level of Marine Corps standards. (Official Marine Corps photo by Cpl. Jorden M. Wells/Released)