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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 2
01-31-2010, 11:29 PM
Tachyon Beam II is a Lieutenant-level power, so it can only replace your bridge officer's Lieutenant-level power (which just happens to be Tractor Beam II). If you go to the skills page of your officer, you'll see that all of their powers are sorted by rank.