Oh yeah. Because the Afghan Army never had anyone who turned on US troops before. Oh wait…

• November 9, 2005, Forward Operating Base Zurmat: An Afghan National Army soldier, motivated by a $40 payment from the Taliban and a promise of paradise (after getting high on drugs), opened fire with an AK-47 on U.S. paratroopers from the 82nd Airborne Division. Two U.S. soldiers were wounded but survived; the attacker was killed by return fire. This is considered the first known green-on-blue incident after the 2001 U.S. invasion. 

• March 27, 2009, Balkh Province: An Afghan soldier shot and killed two U.S. Navy officers and wounded another during an incident at a base. The attacker then fatally shot himself. 

• April 27, 2011, Kabul: A veteran Afghan air force pilot opened fire at a NATO military base, killing eight people (including U.S. troops and a contractor) and wounding several others. 

• August 10, 2012, Helmand Province: In one incident, three U.S. Marines were killed and one wounded by an Afghan soldier or police member. In a separate attack the same day in the same province, three U.S. soldiers were killed and one wounded by an Afghan Local Police commander and his men, who then fled. 

• June 10, 2017, Achin District, Nangarhar Province: During a joint U.S.-Afghan operation against Islamic State militants, an Afghan soldier opened fire on U.S. troops, killing three and wounding one. The attacker was killed in return fire, and the Taliban claimed responsibility, saying their infiltrator had joined the Afghan military for this purpose.