F-106A 56-0467 and 57-00233 at Convair in early 1961 during the upgrade from TEST-TO- TACTICAL instruments. These two early year aircraft were both models originally committed as TEST, or BAILMENT, aircraft. There were returned to Convair and upgraded from from TAC Conventional to Vertical instruments in 1961. The fuselages were cut in half at station 412 (Aft bulkhead missile bay) and a new fuselage, cockpit section, and nose section was installed with the latest production avionics, the same as the last F-106A 59-0148 and F-106B 59-0165. A total of 35 aircraft (28 "A" models and 7 "B" models) were converted this way and reassigned to various ADC units.