Capt. Michelle Kelly, center, of Fort Drum, with face painted, prepares to conduct patrols during the Ranger Course at Fort Benning, Ga., on May 19. (U.S. Army)

Soldiers conduct combat training during the Ranger Course on Fort Benning, Ga., April 20, 2015. (Dacotah Lane/U.S. Army)

Army Sgt. 1st Class Brian Thomas displays a large python during an event at Hurlburt Field, Fla., on April 4, 2015. (John Bainter/U.S. Air Force)

A Ranger instructor checks the equipment of a female student at Eglin Air Force Base before an airborne jump using parachutes. (Yvette Zabala-Garriga/U.S. Army)

Soldiers participate in combatives training during the first gender-integrated Ranger Course on Fort Benning, Ga., April 20, 2015. (U.S. Army photo)

Capt. Kristen Griest, left, and 1st Lt. Shaye Haver, right, will become the first female soldiers ever to graduate from Ranger School on Aug. 21, 2015. (Nikayla Shodeen and Ebony Banks/U.S. Army)

Soldiers display teamwork during the Ranger Course on Fort Benning, Ga., on April 21, 2015. (Dacotah Lane/U.S. Army)

Soldiers attend the Ranger Course to learn additional leadership and small unit technical and tactical skills in a physically and mentally demanding, combat simulated environment. This scene from the course was taken on April 21, 2015. (Dacotah Lane/U.S. Army)

Soldiers conduct combatives training during the Ranger Course on Fort Benning, Ga., April 20, 2015. (Dacotah Lane/U.S. Army)

U.S. Army Soldiers during the Ranger Course on Fort Benning, Ga., on April 21, 2015. (Paul Sale/U.S. Army)

Soldiers negotiate the Darby Queen obstacle course during the Ranger Course on Fort Benning, Ga., on April 26, 2015. (Nikayla Shodeen/U.S. Army)

Soldiers participate in rappel training during the Ranger Course on Camp Merrill in Dahlonega, Ga., on July 12, 2015. (Yvette Zabala-Garriga/U.S. Army)

U.S. Army Soldiers conduct combatives training during the Ranger Course on Fort Benning, Ga., on April 20, 2015. (Dacotah Lane/U.S. Army)

U.S. Army Soldiers conduct combatives training during the Ranger Course on Fort Benning, Ga., on April 20, 2015. (Dacotah Lane/U.S. Army)

In this file photo from April 20, 2015, soldiers participate in close-arm combatives training during the Ranger Course at Fort Benning, Ga. (Nikayla Shodeen/U.S. Army)

In this file photo from April 21, 2015, U.S. Army soldiers negotiate the Darby mile and an obstacle course during the Ranger Course at Fort Benning, Ga. (Dacotah Lane/U.S. Army)