A Delta IV rocket carrying the seventh Wideband Global satcom satellite lifts off from Cape Canaveral Air Force Station, Fla., on Thursday, July 23, 2015. ()

Master Sgt. Todd Boren and Staff Sgt. Gregory Carter, 5th Security Forces Squadron ranger assessment course cadre members, push Staff Sgt. Miguel Garcia, a 5th SFS member, into the pool for a water confidence exercise during pre-ranger training at Minot Air Force Base, N.D., on Wednesday, July 15, 2015. ()

An F-35 Lightning II assigned to the 61st Fighter Squadron at Luke Air Force Base takes off on Tuesday, July 28, 2015. Since 2010, the F-35 has flown more than 30,000 hours. (Staci Miller/U.S. Air Force)

Airmen from the 415th Special Operations Squadron stand on top of a C-130 Hercules to watch the Royal Canadian Forces Snowbirds perform on Friday, July 24, 2015, in Lethbridge, Alberta province, Canada. The C-130 static display and Snowbird performance were part of the 2015 Lethbridge International Airshow. (Christian Clausen/U.S. Air Force)

Rocco, a German Shepherd military working dog, led by handler Senior Airman Jordan Fuller, prepares to subdue a simulated aggressor during a demonstration at Joint Base San Antonio-Lackland Medina Annex, Texas, on Thursday, July 23, 2015. Both Rocco and Fuller are attached to the 802nd Security Forces Squadron military working dog section. (Taylor Curry/U.S. Air Force)

Members of the 122nd Fighter Wing Fire Department, from the 122nd Fighter Wing in Fort Wayne, Ind., battle a simulated aircraft fire on Wednesday, July 22, 2015, at the Combat Readiness Training Center in Alpena, Mich. ()

Army and Air National Guardsmen carefully exit the helicopter pad at the Mile Bluff Medical Center, Mauston, Wis., on Wednesday, July, 22, 2015, after loading a patient into a Wisconsin Army National Guard UH-72A Lakota Light Utility Helicopter. These Guardsmen, along with about 50 Mile Bluff staffers, participated in PATRIOT Exercise 2015, a domestic operations exercise that tested and trained military and civilian first responders on their natural disaster response. ()