Then U.S. Army First Lieutenant Kirsten Griest (C) and fellow soldiers participate in combatives training during the Ranger Course on Fort Benning, Georgia, in this handout photograph taken on April 20, 2015 and obtained on August 20, 2015. When Griest and another woman completed the daunting U.S. Army Ranger school this week they helped end questions about whether women can serve as combat leaders, as the Pentagon is poised to open new roles, including elite Navy SEALs, to women in coming months. The feat by Griest and First Lieutenant Shaye Haver followed a re-evaluation of the role of women after their frontline involvement in Iraq and Afghanistan and the end of a rule barring them from combat roles in 2013. (Photo by Spc. Nikayla Shodeen/Reuters/U.S. Army)

U.S. Army Soldiers take part in the Ranger Course on Fort Benning, Georgia, April 21, 2015. When two women completed the daunting U.S. Army Ranger school this week they helped end questions about whether women can serve as combat leaders, as the Pentagon is poised to open new roles, including elite Navy SEALs, to women in coming months. Army Captain Kristen Griest and First Lieutenant Shaye Haver on Tuesday completed a 62-day course including parachute jumps, helicopter assaults, swamp survival and small unit leadership that earned them a Ranger badge. (Photo by Sgt. Paul Sale/Reuters/U.S. Army)

Captain Kristen Griest (R) participates in the Darby Queen obstacle course as part of the training at the Ranger Course on Ft. Benning Georgia, June 28, 2015. (Photo by Pfc. Ebony Banks/Reuters/U.S. Army)

Captain Kristen Griest (R) participates in an obstacle course during training at the U.S. Army Ranger School on Ft. Benning Georgia, June 23, 2015. (Photo by Staff Sgt. Scott Brooks/Reuters/U.S. Army)

1st Lt. Shaye Haver (R) conducts Mountaineering training during the Ranger Course on Mount Yonah in Cleveland, Georgia July 14, 2015. (Photo by Pfc. Ebony Banks/Reuters/U.S. Army)

U.S. Marine and Female Engagement Team leader Sgt. Sheena Adams (L) and H.N. Shannon Crowley from First Battalion, Eighth Marines sit in an armored vehicle before heading out on an operation from their base at Musa Qala in southern Afghanistan's Helmand province, November 13, 2010. (Photo by Finbarr O'Reilly/Reuters)

U.S. Army convoys are given the thumbs up from a fellow soldier after crossing into Kuwait during the last convoy out of Iraq December 18, 2011. (Photo by Shannon Stapleton/Reuters)

Village elder Haji Amir Mohammad Agha presents a rose to U.S. Army Spc Charli Johnson during a visit by Afghan and U.S. soldiers in Jelawar in the Arghandab Valley north of Kandahar, Afghanistan April 18, 2011. (Photo by Bob Strong/Reuters)

U.S. Army soldier SSG Norma Gonzales of 426 Civil Affairs Battalion reads a magazine next to fellow soldiers while waiting to be ferried by a helicopter to different U.S. military bases in Kandahar, southern Afghanistan October 11, 2012. (Photo by Erik De Castro/Reuters)

U.S. Marine Capt. Jill A. Leyden of Easton, Maryland, touches the grave of her friend Major Megan M. McClung at Arlington National Cemetery in Virginia on Veterans Day, November 11, 2010. McClung was killed during Operation Iraqi Freedom on December 6, 2006. Leyden and McClung served together in Iraq. (Photo by Kevin Lamarque/Reuters)

Hospital personnel attempt to revive a mortally wounded Marine after he was brought in by medevac helicopter at Camp Dwyer near the town of Marjah in Helmand Province, Afghanistan, August 22, 2010. (Photo by Bob Strong/Reuters)

U.S. Army Specialist Nicole Derk of the C Company 3/82 Dustoff MEDEVAC performs a system check on a helicopter at the beginning of her shift in Logar province, eastern Afghanistan, November 21, 2011. (Photo by Umit Bektas/Reuters)

A U.S. marine drinks the blood of a cobra during a jungle survival exercise with the Thai Navy as part of the “Cobra Gold 2013” joint military exercise, at a military base in Chon Buri province, Thailand February 20, 2013. (Photo by Damir Sagolj/Reuters)

SPC Erica Taliaferro, a U.S. female soldier from 549th MP Company, Task Force Bronco patrols in Pachir wa Agam district in Nangarhar province, eastern Afghanistan, March 5, 2012. (Photo by Erik De Castro/Reuters)

U.S. female soldier SPC Erica Taliaferro from 549th MP Company, Task Force Bronco eats MRE sandwich with an ISAF Afghan police trainer (R) inside an armored vehicle as troops stayed inside their vehicles for 15 hours during a two-day joint U.S-Afghan military mission conducting “Route Clearing Patrol”, finding and removing roadside bombs on roads, in Nangarhar province, eastern Afghanistan March 8, 2012. (Photo by Erik De Castro/Reuters)

Second Lt. Johanna Shaffer shares a cookie with an Afghan child while under the security of Marines assigned to 3rd Battalion, 8th Marine Regiment (Reinforced), during her all-female team's first mission in Farah Province, February 9, 2009. (Photo by Monty Burton/Reuters/U.S. Marine Corps)

U.S Army PFC Jessica Harmon from Task Force Denali 92 MP carries a peacock at Wazi-Zadram police station in Paktya province, Afghanistan December 11, 2009. (Photo by Zohra Bensemra/Reuters)

Specialist Joanne Read, of the U.S. Army's Bravo Company, 1st Battalion, 36th Infantry Regiment, First Armored Division, helps unload a resupply truck at Command Outpost AJK in Maiwand District, Kandahar Province, Afghanistan, January 24, 2013. (Photo by Andrew Burton/Reuters)

U.S. Army Specialist Nicole Derk of the C Company 3/82 Dustoff MEDEVAC cross-stitches during her shift in Logar province, eastern Afghanistan November 21, 2011. (Photo by Umit Bektas/Reuters)

U.S. Combat Medic Health Care Specialist Seantella Cottner of the 3rd Brigade, 10th Mountain Division plays the saxophone in her Forward Aid Station tent on the Combat Operation Outpost (COP) McClain in Logar Province in Afghanistan July 22, 2009. (Photo by Shamil Zhumatov/Reuters)

U.S. Air Force TSgt. Jennifer Kinney treats a soldier who is suffering from combat stress at Combat Stress Control Clinic of 125 BSB Charlie Medical Company of Task Force Mustang at Forward Operating Base (FOB) Shank, in Logar province, eastern Afghanistan November 11, 2011. (Photo by Umit Bektas/Reuters)

U.S. Army soldier SPC Katie Luna of 572nd Military Intelligence Company, 8th Squadron, 1st Cavalry Regiment cries while paying respects during a memorial service for platoon member, late SPC Brittany Gordon at Camp Nathan Smith in Kandahar province, southern Afghanistan October 19, 2012. Gordon was killed together with another U.S. civilian and two others, after an Afghan NDS police exploded a suicide vest he was wearing in Kandahar province, a military officer said. (Photo by Erik De Castro/Reuters)

U.S. Air Force Major Stacie Shafran carries her luggage to a loading paddock while waiting for her departure from Iraq at the former U.S. Sather Air Base near Baghdad, Iraq, December 14, 2011. (Photo by Shannon Stapleton/Reuters)