N412PP - U.S. Park Police Aviation Unit based at the Anacostis Naval Annex in Washington, D.C. Since its formation in 1973, this unit has transported hundreds of patients as part of its EMS mission. Thanks to John Konopka. Added 07/12/2003.

N412PP / N22PP - U.S. Park Police Aviation Unit fleet consists of two Bell 412's and one Bell 206. In addition to EMS operations, the Park Police Aviation Unit performs SAR and Law Enforcement. The Unit also supports the U.S. Secret Service with Presidential and dignitary protection. Thanks to John Konopka. Added 07/12/2003.

N135MH - MedSTAR 1 is based at the Washington Hospital Center in Washington, D.C. This EC135 went into service in December, 2000. MedSTAR operates 4 helicopters and transports more than 3,000 patients each year. Thanks to Stacy L. Howell. Added 05/12/2001.

N136MH - MedSTAR 2 from the Washington Hospital Center in Washington, D.C. This EC135 went into service in 2001 and is based at the Maryland Airport in Indian Head. Thanks to Stacy L. Howell. Added 06/16/2001.

N137MH - MedSTAR 3 from the Washington Hospital Center in Washington, D.C. is based at the Easton Airport. The vendor for MedSTAR is CJ Systems Aviation Group. Thanks to Ralph Pettersen. Added 06/24/2003.

N39181 - MedSTAR backup helicopter. This BK117 is a 1983 model and was the third prototype BK117 produced.  Photo was taken at John Hopkins Hospital. Thanks to Jim Davey. Added 01/25/2003.