Do the F-15s engage incoming bandits at all? If they do, then it doesn't really matter if you can call them up on the menu, because eventually all escorts break off to attack once the target/threat is close enough.
Besides, in a theatre heavily defended by SAMs, Air Force fighters aren't that effective anyways.....with their SARH Sparrows. Deathscythe's fix addresses this problem somewhat, as now F-15Cs and F-16Cs are armed with AIM-120 AMRAAMs.