sentences:  In February 1970 Project CREEK STEP called for the buildup of Zaragoza Air Base as a USAFE weapons training site, with actual use of the Bardenas Reales Air-to-Ground Bombing and Gunnery Range (about 45 mi/70 km northwest of the base) began in March.With the closure of Wheelus Air Base in Libya, Zaragoza returned to active status on 19 February 1970 with the activation of the 86th Air Division.The 406th was elevated to Wing status on 21 July 1972.