[quote=@Silverwind Blade]
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That's pretty interesting, and kind of useful. I did read a couple of years ago that the Sidewinder had been tested as an air-to-ground missile around the same time, but I never read any follow-up news on it. I guess the PL-9 shows that it can be done. 
[/quote]

Well, the SA-6 and RIM-7 Sea Sparrow also have land-attack modes.

AGM-87 'Focus' was the IR-homing version designed to home-in on trucks moving at night.

AGM-122 were passive radar-guided, often also fitted with parachutes that would allow them to 'loiter' over suspected radar-stations, and you could carry A LOT of them.

MIM-72 was the ground-launched version that remained popular until '98 since it was WAY more effective than the redeye.