U.S. Navy Cmdr. Gareth Montgomery, the Installation & Logistics (I&L) Director, Marine Corps Air Station (MCAS) Yuma, views the ongoing construction of the border wall on the Barry M. Goldwater Range aboard MCAS Yuma, Oct 30, 2020. I&L is responsible for all military construction on the installation. (U.S. Marine Corps photo by LCpl. Gabrielle Sanders) - U.S. Navy Cmdr. Gareth Montgomery, the Installation & Logistics (I&L) Director, Marine Corps Air Station (MCAS) Yuma, views the ongoing construction of the border wall on the Barry M. Goldwater Range aboard MCAS Yuma, Oct 30, 2020.