Airmen assigned to the 158th Fighter Wing, Burlington Air National Guard Base, watch as the last four F-16 Fighting Falcons assigned to the 134th Fighter Squadron, 158th FW, taxi in preparation to depart from the base to assignments at other locations during a "Viper Out" ceremony at the Vermont Air National Guard Base, South Burlington, Vt., April 6, 2019. The F-16s are leaving the VTANG after 33 years of service ahead of F-35 Lightning IIs arriving later in 2019.