USS Big Horn (AO-45/WAO-124/IX-207) was a Q-ship of the United States Navy named for the Bighorn River of Wyoming and Montana.
USS Big Horn (AO-45)
Q-ships, also known as Q-boats, decoy vessels, special service ships, or mystery ships, were heavily armed merchant ships with concealed weaponry, designed to lure submarines into making surface attacks. This gave Q-ships the chance to open fire and sink them.
British First World War Q-ship HMS Tamarisk
Q-ships hid naval guns behind moveable or pivoting panels
USS Atik (AK-101)
USS Big Horn (AO-45)