In the past, you’d have had the ‘posse comitatus’ statutes to worry about (the army can’t be used on it’s citizens).
Now that we live in a monarchy, we don’t have those sorts of issues.
Actually, there are several legal ways around “posse comitatus”. A team of 3 members could be deputized while home on “leave”. Recently released or retired members could be recruited and deputized. Above all the team would need to be experienced in small team kill/capture missions. Yes, although there is a remote possibility of a capture, in all probability it will be a kill mission. If the “play soldiers” continue the way they are I suspect there will be more killings.