A U.S. Marine Corps CH-53E Super Stallion and U.S. Army MH-60M Black Hawks assigned to Marine Corps Aviation Weapons and Tactics Squadron One (MAWTS-1) conduct an aerial refueling exercise in support of Weapons and Tactics Instructor course (WTI) 1-18 in Yuma, Ariz., Oct. 6, 2017. (Sgt. Allison Lotz/Marine Corps) 
Aviation Structural Mechanic Airman Tate Kern, left, and Airman Tristain Smith clean pad eyes aboard the flight deck of the aircraft carrier USS Nimitz (CVN 68), Oct. 3, 2017, in the Arabian Gulf. (MC3 Ian Kinkead/Navy) 
A U.S. Air Force F-35A Lightning II fighter aircraft lands on the flight line Oct. 12, 2017, at Eielson Air Force Base, Alaska. The F-35 is here to conduct cold weather testing to ensure the fifth generation multi-role fighter aircraft performs optimally in Alaska’s harsh weather conditions. (Airman 1st Class Eric M. Fisher/Air Force) 
Philippine Marines load onto an MV-22B Osprey tiltrotor aircraft on Oct. 8, 2017, during exercise KAMANDAG at Colonel Ernesto P. Ravina Air Base, Philippines. (Cpl. Stormy Mendez/Marine Corps) 
A California Army National Guard Black Hawk conducted water drops on the Northern California Fires in and around Santa Rosa on Oct. 12, 2017. As of Oct. 12, the Cal Guard had dropped more than 60,000 gallons of water on the fires across Northern California. (Master Sgt. David Loeffler/California Air National Guard)
