I am not sure why you are assuming I am referring to domestic military personnel. I have recently finished reading a few books on the Soviet/Russian wars in Georgia and the surrounding areas. I can assure you that many military and police forces around the world do not show the same concern for collateral damage and harm to innocents that is generally shown by American military and police forces. And are you opposed to military tactics and gear flowing to domestic law enforcement if it benefits officer safety?
Re foreign military personnel, true. But I don't care as much about what they do as what we do. I had the "pleasure" of working "along side" (COUGHCOUGH) the Russian Federation Army. I neither like nor particularly respect the Russian Federation Army, nor did I particularly like them orientating their weapons at us when we were not allowed to do the same.
And to answer your question, obviously it depends. If the military develops some new type of body armor or medical equipment, I don't have any problems with LE using it. Why should I? My sole criteria is very simple. Anything that is forbidden to the general public should be forbidden to law enforcement, as they are also civilians. If you or I are not allowed to have a brand new auto, neither should law enforcement. If a vest or medical equipment is restricted from general purchase, so should it be restricted from law enforcement. If it benefits officer safety, it should be allowed to benefit the general population as well.
If it is forbidden from the general population, it obviously is too dangerous to be trusted to law enforcement.
Tactic wise is a bit more blurry, I will concede. My argument would be "least tactical necessary to realistically get the job done". If you know your suspect gets up at 6:45 every day to go to work, perhaps you should send two guys to arrest him when he's about to get in his car. As opposed to a no knock dynamic entry with flashbangs and a full SWAT team at 0300.
Police work is an extremely safe line of work. It's not nearly as dangerous as roofing, driving a truck, or farming. It's NOWHERE near as dangerous as fishing, logging or flying.