The King Air 100 was a transitional model between the 90 and the 200. They were not really rare in the civilian market but the Army only had five, designated U-21F. They were scattered around the world, causing logistic problems. Our TO&E at NAS Dallas called for 5 F/W aircraft so we ended up with all 5. Very similar to the C-12 (BE-200) but without the T-tail.
One of the five King Air 100s owned by the U.S. Army.
One of the five King Air 100s owned by the U.S. Army.