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The WLBB-30 is the United States Coast Guard Cutter (USCGC) Mackinaw. The WLBB portion indicates the type of ship, in this case a Great Lakes Icebreaker, and the 30 is the unique hull number assigned the ship. Due to the Mackinaw's unique mission as an icebreaker and buoy tender, it has a unique classification based on WLB Seagoing Buoy Tenders and the additional B for its icebreaking capability.

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Q: What does WLBB-30 stand for in USCG ship classifications?
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