The Army uses these planes as versatile role jets.
Say what?
The plane design got approval in 1976.
The YF-16 was announced winner over the YF-17 and other competitors in January, 1975, the fly-off having been held in 1974. FWIW, the YF-17 was adapted to naval standards and became the F/A-18.
These jets emerged out in 1979.
Sounds like the writer's first language is not English. That said, the first F-16A (Full Scale Development) left General Dynamics factory in October1976 and flew in December of the same year. The first production F-16 first flew in August, 1978 and was accepted by the USAF in January, 1979.
While I found these details in W'pedia, I was not surprised, as my employer in 1978 made displays for the F-16. The displays were in full production in early 1978. I, OTOH, saw S/N 001 F-18 HUD shipped and contributed to the testing of S/Ns 002-025. After which I worked on new and RMA A-10 Projection Units until moving on to a different company.