The Pentagon's only maximum security prison, at the U.S. Army's Fort Leavenworth in Kansas, is one of the facilities being considered for placement of Guantanamo prisoners deemed too dangerous to release. Julie Denesha/Getty Images hide caption

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U.S. Marines arrive at Saudi Arabia's Dhahran Air Base on Aug. 21, 1990. The U.S. began a buildup in the region just days after Iraq invaded Kuwait on Aug. 2 of that year. The U.S. military has been active in Iraq virtually nonstop for the past quarter-century. Gerard Fouet/AFP/Getty Images hide caption

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Alan Oates was exposed to herbicides, such as Agent Orange, while serving in Vietnam in 1968. Decades after returning home, he was diagnosed with Parkinson's disease, and because Congress passed the Agent Orange Act, he's able to receive VA benefits. Courtesy of Alan Oates hide caption

itoggle caption Courtesy of Alan Oates

Army Cpl. Simranpreet Lamba (center) stands in formation with fellow soldiers before taking the oath of citizenship, prior to his graduation from basic training at Fort Jackson, S.C., in 2010. He was the first enlisted soldier to be granted a religious accommodation as a Sikh since 1984. Brett Flashnick/AP hide caption

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Chagossians weep at the grave of their parents on Peros Banos Island April 10, 2006. Fifteen elders are allowed to visit once a year. AFP/Getty Images hide caption

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Sgt. Courtney White carries her machine gun before a live fire exercise at the Marine base at Twentynine Palms, Calif. David Gilkey/NPR hide caption

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As an Army chaplain in Iraq, David Peters administered last rites and grieved with survivors. When he came home, he says, he "fell apart emotionally and spiritually." Courtesy of Robert K. Chambers hide caption

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A helicopter's eye view of a new ETU, funded by USAID and built by Save the Children. Kelly McEvers/NPR hide caption

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Iraqi soldiers walk in Jurf al-Sakhr, south of the capital Baghdad, on Monday after Iraqi military forces retook the area from Islamic State militants. Iraqi forces, supported by U.S. airstrikes, have made limited gains in recent months, but critics are questioning whether the U.S. strategy is likely to succeed. Haidar Mohammed Ali/AFP/Getty Images hide caption

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Afghan National Security Adviser Mohammad Hanif Atmar (right) and U.S. Ambassador to Afghanistan James Cunningham exchange documents after signing the Bilateral Security Agreement, with Afghan President Ashraf Ghani (rear, left) and Chief Executive Abdullah Abdullah in the background. Jawad Jalali/EPA/Landov hide caption

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US soldiers have intervened in during natural disasters such as the 2010 earthquake in Haiti. But a disease outbreak is more complicated. SSgt. Chad Chisholm/U.S. Dept. of Defense hide caption

itoggle caption SSgt. Chad Chisholm/U.S. Dept. of Defense

U.S. Maj. Gen. Harold Greene was visiting an Afghan military training academy Tuesday when he was shot dead by an Afghan soldier, who was subsequently killed. Afghan troops who knew the attacker say he disliked the Taliban and they aren't sure what his motive was. U.S. Army/Getty Images hide caption

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Vietnam veterans Melvin Morris (center), Jose Rodela (obscured) and Santiago J. Erevia (left) received the Medal of Honor from President Obama at the White House on Thursday. Win McNamee/Getty Images hide caption

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The photo that has offended many. The soldier responsible for posting it on Instagram has been suspended and an investigation has begun. Wisconsin National Guard Facebook page hide caption

itoggle caption Wisconsin National Guard Facebook page