Bronzewing-class harbour tug
 The Bronzewing-class harbour tug was a class of four tugs constructed for the Royal Australian Navy. HTS 503 was given to Papua New Guinea in 1974. They were constructed by Stanard Bros Sydney except for HTS Mollymawk (504) that was constructed by Perris Engineering Brisbane.Bronzewing (HTS 501)Currawong (HTS 502)HTS 503Mollymawk (HTS 504)↑ ↑