1979: THREE-MILE ISLAND DISASTER. Through 15 April, after the Three-Mile Island nuclear power plant fails near Harrisburg, Pa., MAC flies 15 support missions (two C-5s, one C-130, and 12 C-141s). The aircraft deliver a 40,000-pound rawindsonde station, lead bricks and shielding, a water filtration unit, charcoal filters, and potassium iodine for the cleanup. Later, the aircraft fly out barrels of contaminated water.