The STATO mooring anchors were designed to be used in (1) permanent mooring such as Fleet moorings, or (2) in situations where large holding powers are required such as in salvage operations, or (3) in the temporary mooring of large barges or vessels. In-service tests were requested by the Naval Facilities Engineering Command to determine any adverse operational characteristics which might become apparent through varying or continuous operational use. STATO anchors were substituted for Navy Stockless anchors of equivalent holding power already attached to two Fleet mooring assemblies of different capacities in the Navy Harbor Complex in San Diego Bay during the regular Public Works Center inspection of moorings. This report describes the fabrication and installation of the anchors and the results of a 1-year operation. The anchors were removed from the water and inspected after the test period. The results of the evaluation showed no adverse operational characteristics and that the anchors performed satisfactorily. (Author).