Capt. "Deuce" briefs distinguished visitors about the capabilities of the F-35 joint strike fighter Friday (May 5) at Volk Field Combat Readiness Training Center. Volk Field is hosting Northern Lightning, an annual counterland training exercise that began May 1 and will end May 12. The exercise will involve aircraft and personnel from multiple active duty Air Force, National Guard and Navy. Northern Lightning is one of seven Air National Guard joint accredited exercises held at a Combat Readiness Training Center. The two-week long exercise will provide participating units a tactical level, joint training environment emphasizing user-defined objectives. Wisconsin Department of Military Affairs photo by Vaughn R. Larson