How to Prepare for Military Events at Altitude 1st Lt. Krosby Keller, 225th Air Defense Squadron air battle manager, runs the San Diego 100 ultra marathon June 8, 2018. The San Diego 100 is a mountain race that takes place east of San Diego in June every year that runs through the Pacific Coast Trail and Cuyamaca State Park. (Photo by Maj. Kimberly Burke, Western Air Defense Sector) Recently, some of my training partners were preparing to take fitness tests and for a pre-selection event with the Special Forces Reserve Unit, the 19th Special Forces Group in Salt Lake City, Utah. They are prior active duty and now ArmyNational Guard and Reservists in California. This group has a single focus to pass the Special Force Readiness Evaluation (SFRE) tryout so they may attend Special Forces Assessment and Selection (SFAS) at Fort Bragg, North Carolina.