The missions of the United States Park Police Aviation Unit include aviation support for law enforcement, medevac, search and rescue, high-risk prisoner transport and presidential and dignitary security. The Aviation Unit has provided accident-free, professional aviation services for over 40 years. They were the first helicopter provider of Air medical services within Washington, D.C, and continue to provide these services 24/7 to the district and neighboring jurisdictions. They also provide an invaluable resource for patrolling and performing rescues at the numerous federal parks and recreation areas within the National Capital Region, such as Great Falls Park and Shenandoah National Park. Like many park environments, injured parties in these remote and difficult to access locations require specialized rescue equipment to access and retrieve persons in distress. The US Park Police Aviation Unit is the primary resource for these remote rescues requiring helicopter access.