An Israeli Army tank patrols along the border between Israel and the Gaza Strip on May 29, 2018. Israel's military struck more than 30 "military targets" in the Gaza Strip in response to a barrage of rocket and mortar fire from the Palestinian enclave, the Army said. (Jack Guez/AFP via Getty Images)
West Point cadets hug after receiving their diplomas during graduation ceremonies at the United States Military Academy on May 26, 2018, in West Point, N.Y. (Julie Jacobson/AP)
Israel launches a missile from the Iron Dome air defense system, designed to intercept and destroy incoming short-range rockets and artillery shells, from a position in the southern Israeli city of Ashkelon on May 29, 2018. (Menahem Kahana/AFP via Getty Images)
From left, John Kline, a veteran Marine with special naval operations, 1959-1964, Vince Fatiga, Vietnam Army veteran, and Councilman and military veteran David Oh salute after Kline and Fatiga placed a wreath at the Philadelphia Vietnam Veterans Memorial in Philadelphia on May 28, 2018. (Jessica Griffin/The Philadelphia Inquirer via AP)
Israeli soldiers take position during clashes with Palestinian protesters following a weekly demonstration against the expropriation of Palestinian land by Israel in the village of Kfar Qaddum, near Nablus in the occupied West Bank, on May 25, 2018. (Jaafar Ashtiyeh/AFP via Getty Images)
Visitors look on as U.S. Marines and French and German soldiers commemorate the 100th anniversary of the World War I Battle of Belleau Wood on Memorial Day at the Aisne-Marne American Cemetery on May 27, 2018 near Chateau-Thierry, France. (Sean Gallup/Getty Images)
United States Naval Academy midshipmen celebrate during their graduation ceremony in Annapolis, Md., on May 25, 2018. (Jim Watson/AFP via Getty Images)
A Russian honour guard soldier marches at the Tomb of the Unknown Soldier in Moscow on May 26, 2018. (Alexander Nemenov/AFP via Getty Images)
Legionnaires and their goat mascot march during the Armed Forces Day parade on May 26, 2018 in Logrono, Spain. (Carlos Alvarez/Getty Images)
A French military band performs next to a plane during a ceremony to celebrate the centenary of Britain's Royal Air Force at the hotel des Invalides in Paris on May 25, 2018. (Philippe Lopez/AFP via Getty Images)
Corazzieri, of the Italian military presidential honor guards, stand guard in front of the door during the meeting between designated Prime Minister Carlo Cottarelli and Italian President Sergio Mattarella at the Quirinale Palace in Rome on May 29, 2018. (Alberto Pizzoli/AFP via Getty Images)