The ship was built by Pusey & Jones Corp. of Wilmington, Delaware, Hull Number 1108, as the USACS William H. G. Bullard named for Rear Adm. William H. G. Bullard. She was the first of two Maritime Commission type S3-S2-BP1 ships built for the US Army Signal Corps near the end of World War II. The other ship was the Albert J. Myer, which later joined her sister ship in naval service as the USNS Albert J. Myer (T-ARC-6). The ship was built by Pusey & Jones Corp. of Wilmington, Delaware as Hull Number 1108.[1][2]
The ship was assigned to and largely worked on installation of the Sound Surveillance System (SOSUS) under its unclassified name for installation, Project Caesar.
Neptune performed cable repair duties all over the world until 1991, when she’d been in service for some 38 years. During her career, she received a Navy E ribbon in 1988.
Inactivated in 1991, the same year in which the SOSUS mission was declassified, she was placed in the James River reserve fleet near Ft. Eustis, VA on 24 September 1991. The ex-Neptune was removed from the fleet 6 December 1994 to stripped. The ship was dismantled and recycled by International Shipbreaking Ltd. of Brownsville, TX in late 2005.
https://en.wikipedia.org/wiki/USNS_Neptune_(ARC-2)