The Ocean Survey Vessel (OSV) Bold was operated by the United States Environmental Protection Agency. Originally commissioned as the USNS Vigorous, it was renamed USNS Bold (T-AGOS-12) and was a Stalwart-class Auxiliary General Ocean Surveillance Ship of the [Military Sealift Command of the United States Navy, as designated by the "T" preface to her AGOS classification].Stalwart class ships were originally designed to collect underwater acoustical data in support of Cold war anti-submarine warfare operations in the 1980s. * USNS Bold (T-AGOS-12) at the Washington Navy Yard