English: Thomas T. Moore and his “Jetvest” in 1957. Tests on the Small Rocket Lift Device (Jump Belt) under Phase I, were completed during June 1961. It was concluded that the system design was safe and reliable enough to proceed with manned tethered and free-flight testing. Also known as the "Jet Vest," design fabrication and static testing of the device was conducted under contract between the U.S. Army Transportation Research Command and Bell Aerosystems Company.