All, Did a little searching and came up with the following aircraft registered to the Maryland Natural Resource Police (callsign Natural #): N16717 Bell 206- helo N6021V Bell OH-58A - light helo N6266X Aero Commander 500-A -twin engine fixed-wing light transport N82002 Hughes TH-55 - light, two seat helo RON ANNE ARUNDEL COUNTY, MD (NEAR BWI)