U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, pull themselves from a frigid lake after conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force firefighters, assigned to the 673rd Civil Engineer Squadron, leave a frozen lake after conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, conduct ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, conduct ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force Senior Airman Joseph Pyun, a fire protection specialist assigned to the 673rd Civil Engineer Squadron, conducts ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Pyun is a native of Cypress, Calif. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force Airman 1st Class Joseph Humphrey, a fire protection specialist assigned to the 673rd Civil Engineer Squadron, pauses for a portrait while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Humphrey is a native of Ridgecrest, Calif. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

Thomas Green, a civilian contractor assigned to the 773rd Civil Engineer Squadron, pauses for a portrait after conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

Jason Crandall, left and Senior Airman Joseph Pyun, firefighters assigned to the 673rd Civil Engineer Squadron, recover a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, use an inflatable raft to recover a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists Airmen 1st Class Joseph Humphrey, left and Tyler Parmelee, conduct ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Humphrey and Parmelee, natives of Ridgecrest, Calif., and Ashburn, Va., respectively, are assigned to the 673rd Civil Engineer Squadron. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, conduct ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force Airman 1st Class Joseph Humphrey, a fire protection specialist assigned to the 673rd Civil Engineer Squadron, simulates a cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Humphrey is a native of Ridgecrest, Calif. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, use an inflatable raft to recover a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

Jason Crandall, a firefighter assigned to the 673rd Civil Engineer Squadron, prepares to enter a frigid lake while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists Airmen 1st Class Joseph Humphrey, left and Tyler Parmelee recover a simulated victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Humphrey and Parmelee, natives of Ridgecrest, Calif., and Ashburn, Va., respectively, are assigned to the 673rd Civil Engineer Squadron. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists assigned to the 673rd Civil Engineer Squadron, use an inflatable raft to recover a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, use an inflatable raft to recover a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists, assigned to the 673rd Civil Engineer Squadron, practice recovering a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force fire protection specialists Airmen 1st Class Tyler Parmelee, left, and Joseph Humphrey, practice victim recovery while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Parmelee and Humphrey, natives of Ashburn, Va., and Ridgecrest, Calif., respectively, are assigned to the 673rd Civil Engineer Squadron. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force Senior Airman Joseph Pyun, right, assists Senior Airman Zachary Baldwin don a survival suit before conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. Pyun and Baldwin, natives of Cypress, Calif., and Alden, N.Y., respectively, are fire protection specialists assigned to the 673rd Civil Engineer Squadron. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force firefighters, assigned to the 673rd Civil Engineer Squadron, make their way to a frozen lake while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

Kirk Gibbs, center, a fire captain assigned to the 673rd Civil Engineer Squadron, instructs junior fire fighters while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force Senior Airman Zachary Baldwin, a fire protection specialist assigned to the 673rd Civil Engineer Squadron, recovers a simulated cold water victim while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. Baldwin is a native of Alden, N.Y. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)

U.S. Air Force firefighters, assigned to the 673rd Civil Engineer Squadron, make their way over a frozen lake while conducting ice water rescue training at Joint Base Elmendorf-Richardson, Alaska Feb. 4, 2017. The training taught the JBER firefighters self-rescue techniques, victim recovery, and certified them as ice water rescue technicians. (U.S. Air Force photo/Alejandro Pena) (Photo by Alejandro Pena)