Politicians yes, but it would be rare, and easily determined if a military officer pushed for a particular gizmo as a bribe and the intent to get picked up by said company upon leaving the service. Has it happened? I'm sure, but in the case of the F-35, this was just one cluster from the start and primarily driven by budgetary decisions and not operational ones. For example, the USAF NEVER wanted the B-2 and they go it rammed down their throats.
On the Navy side, the F-18 was just a stopgap replacement for the A-7 and F-4, thinking al the time we were going to get the Tomcat 2000 and A-6F and eventually the A-12. When the 12 blew up, the lines had been severed to the F-14 and A-6 so we were stuck with ONE airframe, the 18 which fundamentally changed Naval Aviation for the worse, much worse.
