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Since this one was launched from a submarine, it would have been a UGM-109. A BGM-109 would have been ground-launched. An AGM-109 would be launched from an aircraft.
In actuality, this one was indeed launched from an SSN in the early days of Tomahawk. It was a UGM-109C – you can search on UGM-109 on wikipedia, and it will tell you about the other variants that were available at the time. The aircraft was sitting in a revetment to prove the accuracy of the nav system in the missile (this was before GPS was used in them), and fully fueled to show off what would happen with an airburst detonation. It came off pretty well. ;o)
Source: I co-authored the first US Navy publication to help the submarine force properly utilize Tomahawk and its associated software in the submarine combat system of that time.