There is an underlying natural law to IC's being cheap without any government involvement because printing out circuits with chemicals and light like a photocopier is inherently cheaper than the alternatives of vacuum tubes or discrete components mounted on a board. (For non-trivial circuits where the count/complexity of components exceed the capital cost of lithography etc equipment.)
The privately funded researchers of Texas Instruments and Fairchild Semiconductor already knew integrated circuits would be more cost-effective before the inventions were finally solved. Eliminating the rising labor costs of wiring up old-style discrete components was the motivation to invent integrated circuits.
Therefore, it's not realistic to ponder an alternate history where a government bureaucrat in charge of military spending would have ignored the intrinsic physical properties of ICs and kept choosing vacuum tubes for 1970s F-15 and F-16 fighter jets because he believed "ICs are not inevitable because I have agency to make them not inevitable". Every other rational military on the globe would have chosen ICs which would make American equipment uncompetitive.
What government military contracts did was take intrinsically cheaper technology and fund more iterations to help make it even cheaper.