 The Bureau's first two purpose-built patrol vessels, USFS "Auklet" and USFS "Murre" joined her in 1917.The Alaska enforcement fleet increased further in 1919 with four former United States Navy patrol vessels (USFS "Kittiwake", USFS "Merganser", USFS "Petrel", and USFS "Widgeon") transferred to the Bureau's Alaska fleet, and in 1925 the Bureau established a district headquarters at the Naknek River for the Bristol Bay district and began to acquire a flotilla of motor launches to operate on the rivers, steams, and lakes in that area.The Bureau also chartered vessels to support Alaska fisheries protection, and Bureau patrol boats regularly protected migrating fur seal herds along the coast of Washington and Alaska.