Nice work, I can only find a few major faults with this mission, and those can be easily remedied.
Spelling, mercinary, cripling, ect, double check all of your spelling and sentence structure. Try to say it out loud if that will help. If it doesn't sound right, chances are it won't flow in the mission.
For some reason Iota 1's arrival message comes from command and not Iota 1. I can't really find a reason for this, so it may not be your fault.
In regards to the messages, they scroll by much too quickly and are sent before the previous one has been read. Space the time out for the messages so that you don't have nasty overlap. I find that setting the time for 5000 (5 seconds) is usually enough.
The Aeschylus's survival seems to be a random thing. On my first try through this mission, I lost it when the Bedford arrived. With the second attempt, the Bedford fired on the installation and not the Aeschylus. The player really has little say in the matter, the Bedford may or may not destroy it, and that is a little problematic. Try to make its attack a little more defined. I'm not saying the science cruiser has to die, but actually giving the Bedford the initial order to attack one or the other helps keep the mission focused, and ensures that saving the ship isn't just a matter of luck.
More background would be nice, a good part of the area is just black space, especially behind the Adur as Alpha flies in. You don't have to go overboard, just make sure that the player will usually see an object or a nebula in the background when attacking the enemy.
Other than, the mission seems fine. Its a little hard to lose, but if you just sit there your wingmen can't protecect everything. Nice job I have to say.