Z Dec 06, 2019 03:51 PM Army Helicopters? The flew low through Refugio Pass. Rumble lasted about ten minutes as they headed down to the 101 near el Capitan. Probably nothing to do with Vandenberg AFB, it has no facilities for visiting aircraft, much less thirty aviators looking for a bathroom and coffee refill. CH/MH-47s are wonderful aircraft: 9,000+ horsepower, 26,000+ pound load, seating for up to 55 passengers, 180 mph, and only $40M.