 The several units of the original T-43 class minesweepers transferred from former-Soviet Union have all being retired from active service, placed into reserve fleets subordinated to naval militia for weapon training, while some of the Type 010 class minesweepers remain active despite their age and obsolescence.Shuguan (曙光, meaning dawn) class is the conversion of Type 6610 for ocean surveillance duties, which was the fifth unit built.Later on, a dedicated unit was built for ocean surveillance role from the start.