During WWII, the 4146 Base Unit was involved in secret rocket development at what was then known as Dover Army Airfield. The building complex where these military secret operations took place was Hangar 1301. From the 1950s to the 1970s, various fighter squadrons called the hangar home. In the 1990s after restoration and placement on the National Register of Historic Places, Hangar 1301 was given new life as the home of the Air Mobility Command Museum.
