John Allan Chapman was a combat controller in the United States Air Force who was posthumously awarded the Medal of Honor on August 22, 2018, for his actions in the Battle of Takur Ghar during the War in Afghanistan. He is the first airman to receive the Medal of Honor since the Vietnam War. He was inducted into the Hall of Heroes on August 23, 2018, and posthumously promoted to Master Sergeant on the following day.

The Battle of Takur Ghar was a short but intense military engagement between United States special operations forces and al-Qaeda insurgents fought in March 2002, atop Takur Ghar mountain in Afghanistan. For the U.S. side, the battle proved the deadliest entanglement of Operation Anaconda, an effort early in the War in Afghanistan to rout al-Qaeda forces from the Shahi-Kot Valley and Arma Mountains. The battle saw three helicopter landings by the U.S. on the mountain top, each met with direct assault from al-Qaeda forces. Although Takur Ghar was eventually taken, seven U.S. service members were killed and 12 others were wounded. The battle is also known as the Battle of Roberts Ridge, after the first casualty of the battle, Navy SEAL Neil C. Roberts.