USAF F-16C Block 25, #83119, with a special paint coat used in 'paintless aircraft' testflights [USAF photo]

The first YF-16 (#01567) was used in the early eighties on the Controlled Configured Vehicle (CCV) program. This program tested the possibilities of turning without having to bank. Although achieving promessing results, the advantages (being better aiming when firing a missile...

Conformal Fuel Tank (CFT) testing (#87353). [LMTAS photo]
See also: First phase of flight testing of the F-16 conformal fuel tanks completed

USAF F-16B block 15 #81-0816 is seen here when it was used to test the auto terrain following feature on the viper. [ Michel Klaver collection]

USAF F-16B #75-0752 (and others, all A-models) where used during CAS testing at Nellis AFB. [USAF photo - Mike Kopack collection]