It allows you to command either the refit USS Enterprise, Kruge's "K-22 Klingon Bird-of-Prey" (roughly equivalent to a B'rel-class scout) the or the larger "L-42 Stronger Bird" (similar to the K'vort-class cruiser). Rule variations allow for even matching of ships – the damaged Enterprise versus the K-22, or the full-strength Enterprise versus the L-42.