USNS Able (T-AGOS-20) is a Victorious-class oceanographic survey ship in the service of the United States Navy's Military Sealift Command.

In addition, Able carries electronic equipment to process and transmit that data via satellites to shore stations for evaluation.

She is built on a small-waterplane, twin-hull design for greater stability at slow speeds in high latitudes under adverse weather conditions.

[2] In August 2004, Able was taken out of service and laid up in the Reserve Fleet at the Naval Sea Systems Command's Inactive Ships On-site Maintenance Office at Philadelphia, Pennsylvania.

The service reactivated the ship in 2007, and transferred her to a commercial shipyard in Charleston, South Carolina, where she was converted for AN/UQQ-2 Surveillance Towed Array Sensor System (SURTASS) low frequency active-array capabilities.