Oddly, autogyros just don't seem to be employed in modern military roles. Fixed wing aircraft do certain jobs better, and job that a autogyro could do that an airplane couldn't a helicopter could do even better than the autogyro.
Now way back in WW2 the U.S. Army & Navy used a few Kellet models as scouts, the Japanese used their Kayaba for scouting & anti-submarine warfare(it could carry A depth charge in lieu of carrying the observer). The folks that seemed to do more in direct combat with autogyros were the Soviets. They had two types, used mainly for recce and dropping propaganda leaflets. But their Kamov A-7 had 3 machine guns(one for the observer to use), and was a cool looking machine! And lucky me, I've got a model of it! I've just got to get around to building it!
Sometime I'd love to draw a futuristic military autogyro!!