USNS IMPECCABLE (T-AGOS 23).

The military Sealift Command ocean surveillance ship USNS Impeccable (T-AGOS-23) is one of five ocean surveillance ships that are part of the 25 ships in the Military Sealift Command Special Mission Ships Program. Impeccable directly supports the Navy by using both passive and active low frequency sonar arrays to detect and track undersea threats.