English: A U.S. Navy TH-6B Cayuse helicopter, assigned to the U.S. Naval Test Pilot School, takes off for a training flight from Naval Air Station Patuxent River, Maryland (USA). The United States Naval Test Pilot School (USNTPS) provides instruction to experienced pilots, flight officers, and engineers in the processes and techniques of aircraft and systems test and evaluation. The school investigates and develops new flight test techniques, publishes manuals for use of the aviation test community for standardization of flight test techniques and project reporting, and conducts special projects. USNTPS operates approximately 50 aircraft of 13 types. Note that the helicopter was not assigned a regular U.S. Navy Bureau Number (BuNo) but kept its U.S. Army serial 69-16061 (displayed as "696061").