I would, if I hadn't missed it. Unless they put in a way to earn it later on, I'm out of luck there.
On the original topic, I'm pretty sure the game engine has no real way to identify whether a fellow teammate is in the same fleet or not. Gating a mission for a 5-man team from the same fleet is not quite the same thing.
Because unlike gating a fleet-based mission, you can't assume all of the players are even in a fleet let alone that they share a fleet in common. The game would need logic built in to check every player in every mission and compare them to see who's in what fleet, then adjust the reward on the fly to include fleet marks.
I wouldn't cry if they put that in, of course, but I suspect it would fail the "Bang for the Buck" test.
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How about when a player reaches level 50 instead of combining all of the experience you get with each mission and kill why not take the experience that your player would receive and convert it to fleet marks. With this system you would leave the bridge officer experience alone. I think this would work because it would make it so we dont have to grind as much and we can play any part of the game we want.