Some relevant quotes from the Wing Commander 3 Novel (WC3N):
Regarding Blair and his injuries from the Battle of Earth (P.7):
"...And, of course, there was the loss of the Concordia.
Blair fought back a shudder. He'd been wing commander aboard the Concordia for three years, until the Battle of Earth. If he hadn't taken that Kilrathi missile which left him grounded for six long months, Blair would have been on board when Concordia fought the rearguard action over Vespus: fought and died. Blair had been part of the survey crew that had discovered the carrier's broken hull lying half-submerged in the waters off the Mistral Coast..."
And then towards the bottom of P.7:
"...Fate had spared him while so many others died. Now Blair, certified to be ready to return to full active duty, had received his new assignment from Admiral Tolwyn's own hands. Wing commander once again... but wing commander aboard the Victory."
I think there are other references toward's his injuries, when Eisen and others question whether Blair was fit to return to duty after a poor mission, but I can't find the exact page reference at the moment.
Regarding Blair and the Tarawa (P.185, after meeting Kevin Tolwyn):
"..."Yes, sir," Blair responded. "We served together on the Tarawa a few years back". He looked Tolwyn over..."
EDIT: This doesn't mean that Blair was present on the Tarawa during the events of End Run and I don't believe that was suggested at all during the novel (ER). I could be wrong or thinking of a different query, but I seem to recall Loaf referring to this reference in a thread a couple of months ago and citing it as one of the examples of "small-universe" syndrome associated with elements of the novels.
Cheers,
BrynS