A maintainer assigned to the 22nd Aircraft Maintenance Squadron, McConnell Air Force Base, Kan., watches an F-22 Raptor taxi during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Red Flag involves a variety of attack, fighter, bomber, reconnaissance, electronic warfare, airlift support and search and rescue aircraft. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Staff Sgt. David Atteberry, an aircraft hydraulic systems technician assigned to the 92nd Aircraft Maintenance Squadron, Fairchild Air Force Base, Wash., takes a moment to look over his work after replacing a KC-135 Stratotanker’s hydraulic system relief valve that covered him in hydraulic fluid during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Aircraft hydraulic system specialists are responsible for everything that deals with hydraulic and pneumatic systems, including landing gears, brakes, flight controls, weapons and cargo door systems. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Staff Sgt. David Atteberry, left, an aircraft hydraulic systems technician assigned to the 92nd Aircraft Maintenance Squadron, Fairchild Air Force Base, Wash., signals to a fellow maintainer while working on the wing of a KC-135 Stratotanker during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Red Flag provides realistic combat training in a contested, degraded and operationally-limited environment, which provides aircrews with real-time war scenarios and helps ground crews test and improve their operational readiness. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Staff Sgt. David Atteberry, an aircraft hydraulic systems technician assigned to the 92nd Aircraft Maintenance Squadron, Fairchild Air Force Base, Wash., fills out paperwork after replacing a hydraulic system relief valve on a KC-135 Stratotanker during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Red Flag provides a series of intense air-to-air scenarios for aircrew and ground personnel to increase their combat readiness and effectiveness for future real-world operations. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Staff Sgt. David Atteberry, an aircraft hydraulic systems technician assigned to the 92nd Aircraft Maintenance Squadron, Fairchild Air Force Base, Wash., replaces a hydraulic system relief valve on a KC-135 Stratotanker during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. Aircraft hydraulic system specialists have knowledge of hydraulic, pneumatic, electrical and mechanical principles applicable to aircraft and support equipment and hydraulic systems. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Two maintainers assigned to the 22nd Aircraft Maintenance Squadron, McConnell Air Force Base, Kan., wait for the aircrew of a KC-135 Stratotanker to finish pre-flight inspections prior to a Red Flag 15-4 sortie at Nellis AFB, Nev., Aug. 25, 2015. Red Flag is a realistic combat training exercise involving the air, space and cyber forces of the U.S. and its allies, and is conducted on the vast bombing and gunnery ranges on the Nevada Test and Training Range during day and night operations. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Staff Sgt. Nicholas Mandello, an electronic environment specialist assigned to the 912th Air Refueling Squadron, March Air Reserve Base, Calif., salutes the aircrew of a KC-135 Stratotanker after marshaling it out for a Red Flag 15-4 sortie at Nellis AFB, Nev., Aug. 25, 2015. Red Flag provides an opportunity for active duty, Reserve and Guardsmen aircrew and maintainers to enhance their tactical operational skills alongside units from around the Air Force. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

Two maintainers assigned to the 22nd Aircraft Maintenance Squadron, McConnell Air Force Base, Kan., wait for the aircrew of a KC-135 Stratotanker to finish pre-flight inspections prior to a Red Flag 15-4 sortie at Nellis AFB, Nev., Aug. 25, 2015. Red Flag involves a variety of attack, fighter, bomber, reconnaissance, electronic warfare, airlift support and search and rescue aircraft. (U.S. Air Force photo by Staff Sgt. Siuta B. Ika)

U.S. Air Force F-16 Fighting Falcons assigned to the 64th Aggressor Squadron wait to take off during Red Flag 15-4 at Nellis Air Force Base, Nev., Aug. 24, 2015. Red Flag involves a series of intense air-to-air combat exercises designed to prepare U.S. and allied forces for future real world conflicts. (U.S. Air Force photo by Senior Airman Thomas Spangler)

An F-16 Fighting Falcon maintainer completes a final pre-flight inspection of an F-16 assigned to the 457th Fighter Squadron, Naval Air Station Fort Worth Joint Reserve Base, Texas, during Red Flag 15-4 at Nellis Air Force Base, Nev., Aug. 24, 2015. The air training missions are conducted over the 2.9 million acre Nevada Test and Training Range. (U.S. Air Force photo by Senior Airman Thomas Spangler)

An F-16 Fighting Falcon assigned to the 457th Fighter Squadron, Naval Air Station Fort Worth Joint Reserve Base, Texas, takes off during Red Flag 15-4 at Nellis Air Force Base, Nev., Aug. 25, 2015. All four U.S. military services, their Guard and Reserve components and the air forces of other countries participate in each Red Flag exercise. (U.S. Air Force photo by Senior Airman Thomas Spangler)

A C-17 Globemaster III assigned to the 437th Airlift Wing, Charleston Air Force Base, S.C., prepares to take off during Red Flag 15-4 at Nellis AFB, Nev., Aug. 25, 2015. A typical Red Flag exercise involves a variety of attack, fighter, bomber, electronic warfare, reconnaissance, recue, aerial refueling and airlift support aircraft. (U.S. Air Force photo by Senior Airman Thomas Spangler)

A C-17 Globemaster III assigned to the 437th Airlift Wing, Charleston Air Force Base, S.C., flies to the Nevada Test and Training Range during Red Flag 15-4, Aug. 25, 2015. With a range of over 2,500 miles, the C-17 is capable of carrying 102 troops or paratroopers or 170,900 pounds of cargo at a service ceiling of 45,000 feet. (U.S. Air Force photo by Senior Airman Thomas Spangler)