Im on the 2nd to last mission and I'm flying a jet or something and I have to protect the president. Well I failed. And right when that happened I hit a checkpoint. So right when it reloads it constantly says I've failed to save the president.

I tried restarting mission, takes me back to the same loadpoint.

Tried selecting an older mission hoping it would unlock the mission I'm on....no luck

I'm playing on veteran and really don't want to restart the campaign