In 1993, the blimp hangars were designated National Civil Engineering Landmarks by the American Society of Civil Engineers (ASCE).
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During his enlistment, Filfred served with Marine Corps unit MAG-46 at the former Marine Corps Air Station El Toro near Irvine, California and with the Marine Corps unit MWSS-374 at the former Marine Corps Air Station Tustin located in Tustin, California.