I don't know how much experience that
Captain Rakoto has with the system, but we learned during our last missions that:
Starfleet Command:
Rally is typically done only by the CO (or XO if in command). It can only be done once per scene. It's mainly for generating momentum, but it also invites a good speech. ;)
Maybe Rakoto would like to give the crew a rousing speech as we approach our destination ... and perhaps give us a small dose of Momentum up our proverbial, communal sleeve, should we need for reacting to any sudden surprises.