A State wide security company that is based in the Town of St Albans, Vt issues their armed guards with Ruger GP 100's, But due to state contract requirements only allows them to be in .38 Special. The guard is allowed to take the Issue weapon home with them, It is up to the guard to provide his own Duty and practice ammo.
Another company Sensor, Does have armed positions, but they allow the guards to choose their own weapon as long as it meets the companies criteria. Most of the armored car companies (Guarda, AMSA, ADM, Wells Fargo, etc) in Vermont are the same way as to weapons policies, Although a small company AMSA also allows there Guards to use Shotguns and AR's as duty weapons also, If Qualified/Trained.
My job with Dept of the Military, State of Vermont, Force protection issues us Fed Gov M9 pistols.
The majority of security companies in Vermont are unarmed. All federal buildings in the state are protected by the Federal Protective Service or US Marshall's. All state buildings are protected by there relevant county Sheriffs deputies.
The 3 different companies that i worked for pretty much left it up to me what i wanted to carry. I remember working for one company which is now defunct, Double Eagle Security, A very bad company to have worked for, Lost there bonds and licenses due to cause. The boss would carry a .22LR Revolver as his duty weapon.