A construction worker builds onto a support beam for a new parking area aboard Marine Corps Recruit Depot San Diego Aug. 16. This is no ordinary parking area, the roof will be lined with solar hot water heating panels. This is just one part of an energy saving project that will help MCRD go green. - A construction worker builds onto a support beam for a new parking area aboard Marine Corps Recruit Depot San Diego Aug. 16. This is no ordinary parking area, the roof will be lined with solar hot water heating panels. This is just one part of an energy saving project that will help MCRD go green.