This is a new method of getting the trophy for completing the mission of veteran difficulty.
This can be used for all of the missions, just make sure you save and quit at the last check point (watching a mission walkthrough on Youtube helps to find where the last one is).
Happy trophy hunting!
The following 3 users say thank you to Alt for this useful post:
getting this legit should be call of duty players aim, should be basic training before going online, specially mile high club on veteran, that makes or breaks people