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Defenders gain new leadership

Col. William Rock, 307th Mission Support Group commander, passes the 307th Security Forces Squadron guidon to Capt. Joel Brown during an assumption of command ceremony on Barksdale Air Force Base, La., June 4, 2017. Brown is assuming command of the 307th SFS and brings additional experience to the unit from serving both as an enlisted Airman and an Army officer. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)

Col. William Rock, 307th Mission Support Group commander, passes the 307th Security Forces Squadron guidon to Capt. Joel Brown during an assumption of command ceremony on Barksdale Air Force Base, La., June 4, 2017. Brown is assuming command of the 307th SFS and brings additional experience to the unit from serving both as an enlisted Airman and an Army officer. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)

Airmen of the 307th Security Forces Squadron render the first salute to their new commander, Capt. Joel Brown, during an assumption of command ceremony on Barksdale Air Force Base, La., June 4, 2017. The Reserve Citizen Airmen of the squadron are trained to protect, defend and fight. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)

Airmen of the 307th Security Forces Squadron render the first salute to their new commander, Capt. Joel Brown, during an assumption of command ceremony on Barksdale Air Force Base, La., June 4, 2017. The Reserve Citizen Airmen of the squadron are trained to protect, defend and fight. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)

Capt. Joel Brown, 307th Security Forces Squadron commander, addresses his Airmen for the first time during an assumption of command ceremony on Barksdale Air Force Base, La., June 4, 2017. Brown is the former operations officer for the 944th Security Forces Squadron, 944th Fighter Wing, Luke AFB, Ariz., and has served as an enlisted Airman as well as an Army officer. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)

Capt. Joel Brown, 307th Security Forces Squadron commander, addresses his Airmen for the first time during an assumption of command ceremony on Barksdale Air Force Base, La., June 4, 2017. Brown is the former operations officer for the 944th Security Forces Squadron, 944th Fighter Wing, Luke AFB, Ariz., and has served as an enlisted Airman as well as an Army officer. (U.S. Air Force photo by Master Sgt. Dachelle Melville/Released)

BARKSDALE AIR FORCE BASE, La. --