“During this period, flying is scheduled to be completed by approximately 10:30 p.m., but days and times may vary based on a number of factors including weather, airspace availability on the Utah Test and Training Range, and other support elements,” Hill AFB said in a press release.

Night operations, a periodic thing at Hill, actually started in late March and will be conducted on most weekdays. The active duty 388th and Reserve 419th Fighter Wings are conducting the training with F-35A Lightning II craft.

“Hill’s fighter wings must train at night to maintain their combat readiness and all-weather capabilities. Night flying is limited to what is required for pilots to remain proficient in those skills,” the press release said. “Over the past two years, all three of the wing’s fighter squadrons have deployed in support of combat operations in the Middle East and remain ready when they are called upon.”