when I worked at a rather large physics lab, making antimatter routinely, we *did* have a visit from besuited serious 'merkins. This is all many many years ago! The discussion was briefly about annihilation, and how many Pbars would fit in a bottle, and how big the bang would be. I think we convinced them that it would take many many many large physics labs in parallel, and a long time, and I certainly wouldn't want to be anywhere near the magnetic confinement bottle.
As for particle beams - they're a doddle when space based as an active denial system (OCS) counter satellite communication system - , the few times I did pass a 40MeV Proton beam through normal air, I reckon it got around an inch before interacting fully. A free space (air) neutron beam might get some metres. There's always laser plasma/paritcle hybrid beams I suppose; A neutrino beam could go rather further, but wouldn't be noticed!
The mil could always accelerate iron or gold or U238 nucleii, they do qualify as corpuscular matter, might need a hand-held wakefield linac?? which would still need almost as big a battery as the pbar mag confinement.
some 2009 (unspecified technology) 'things that go bang in space' funding info at http://www.js.pentagon.mil/descriptivesum/Y2009/AirForce/0604421F.pdf