Looking at your first link referenced item…. All the military comm gear I’ve ever used, repaired, deployed with, etc. was all quite wide with respect to it’s operational spectrum capabilities. Both fixed site and tactical stuff…. Even the ‘fixed frequency’ stuff such as Air Traffic Control equipment could be easily re-tuned (involved procedures) to any frequency in a band that is quite wide when compared to GMRS and/or ham bands.
As for the main topic question, I’d like to say NO!! No government agency, at any level of government, has a “need” for it. Their needs can be met through other methods (other nets / frequencies). In any and/or all instances to which someone knows of an agency that is doing such; I simply suggest that would be an agency staffed with personnel that lack the knowledge and understanding required to establish their required or necessary wireless communications capabilities… or… they are looking for a “quick fix” short-cut to an “aggravating problem” of some kind.
Look, I’ve been there, done that, and wore the t-shirt. In my day using military equipment, I could step on just about any frequency I needed to in order to get the mission done. BUT!!! AIN’T NO WAY I WOULD HAVE EVER DONE THAT!!!!…because my capabilities were sufficiently robust such that there wasn’t (never would be) a ‘real need’ to do such a thing. But, in the world of ‘local governments’ there just happens to be people that don’t know, or understand, such stuff as radio frequency communications systems and the various resources that are allocated to people, groups, organizations, businesses, governments, etc. or how to make effective use thereof. So, wether they know it or not, there are separate sandboxes for those folks to play in. GMRS ain’t it.?
Hope I didn’t hurt anyone's feeling here by shooting off my pie hole…??