[in hoc signo vinces]

The Russians have some cheesy version of this tied to the fire control systems aboard the Mig-29. A real POS, but at least they made the attempt.

[AngryJawa]

I imagine this is a leeeeetle more sophisticated than your typical Rooski hardware.

In Hoc? A Sig are we?

[paddles]

We had VTAS in the F-4 when I was a young lootnik. Very cumbersome and almost worthless unless everybody used it. You had to force the ops/supply/maintencance system to make it work, but many wouldn't do it because they were just waiting for the Phantoms to go away.

[Imnidiot]

From what I read a decade ago, we had tried it in the early '80's but didn't keep at it. The Russians did. They made it work.
After the Fall of the Soviet empire, when our pilots co-trained with the Germans with Soviet hardware, OUR pilots said that any pilot with a helmet-mounted sight, even in a Cessna with a missile, could shoot down one of ours...the helmet mounted system kicked butt and we were behind them at that time. Not now.