The first sounding rocket, the Ammonite I, ascends in the morning in March 1951. It reaches a height just above the Kármán line, collects and transmits telemetry, pressure and temperature data, then falls back into the sea.
Later that year, the first aircraft, the X-1 collects data from other areas of Earth, completes a time at altitude contract, then lands back at Cape Canaveral.











