The aircraft was overhauled and converted to C-45H by the Beech Aircraft Factory in the early 50’s for use by the the USAF and operated as a military transport aircraft until release from service and entry into the civilian market in 1961. After extensive updates that aircraft was issued a standard category Airworthiness Certificate. Updates included-

Hamilton Certification Kit-STC SA-442
Extended Tailwheel
E-18S wingtips
Wrap Around windshield
Streamlined nose
Stabilizer Angle of Incidence Kit
Standard cabin windows
Hamilton Air Stair door
Outside Baggage Door
2-37 Gallon outer wing fuel tanks (6 total tanks)
Custom Interior with reclining seats
Accordion Cockpit door
Late model crew seats
Overhead cabin lighting