Photo Slideshow: Progress continues on new Wilford Hall Ambulatory Surgical Center Published July 8, 2015 JOINT BASE SAN ANTONIO-LACKLAND, Texas -- Construction continues on the new Wilford Hall Ambulatory Surgical Center on Joint Base San Antonio-Lackland, Texas. The new WHASC, part of the 59th Medical Wing, is a $418 million, 682,000 square foot, state-of-the-art facility that will replace the existing building. Serving more than 55,000, the WHASC will be the Department of Defense's largest outpatient ambulatory surgical center. For a sneak peak at the new facility, click HERE.