Used by the US Naval Air Mine Defense Unit at Panama City, Florida for the development of airborne mine-sweeping. Did not enter service in first line squadrons
At least 245 BuNos allocated:
- XHSL-1: 129133 - 129136
- HSL-1: 129154 - 129168
- HSL-1: 129843 - 129877
- HSL-1: 129878 - 129941, cancelled and not built
- HSL-1: 135622 - 135717, cancelled and not built
- HSL-1: 138562 - 138576, cancelled and not built
- HSL-1: 140414 - 140429, cancelled and not built.
Of those that were delivered, many went straight into storage at NAS North Island
and NAS Norfolk
(via Joe Baugher).