The High Resolution Imaging Science Experiment camera consists of a 0.5 meter reflecting telescope, the largest of any deep space mission, and has a resolution of 1 microradian, or 0.3 meter at a height of 300 km. (For comparison purposes, satellite images of Earth are generally available to a resolution of 0.1 meter, and satellite images on Google Maps are available to 1 meter.[8]) It can image in three color bands, 400-600 nm (blue-green or B-G), 550-850 nm (red) and 800-1,000 nm (near infrared or NIR).Not too shabby! :-)
It should be, since MRO partnered with the National Reconnaissance Office - the spy satellite guys. :-)