I think that both rookie soldiers and Police should come from a pool formed by a nationwide draft. Then psychological tests, then physical tests. Then a model like Denmark that trains rookies for 3 years. Then sent to a permanent base or precinct or base. Then be there for 4 years. After which they can choose to go to a location of their choice. Or separate. Or finish their 20 years in the peace corps or other Federal or state programs, like wildlife officers. Details could vary but the idea is to have CITIZEN solders or Police, NOT, definitely NOT, MILITIA that are too "gung ho", bloodthirsty and might turn on either the elected government or just individual citizen that they do not like.