After flying it again I think the issue was that I tired left to immediatly take off from runway 16 instead of turning right and doing the back track. So tehcnially I didn't follow the exact ATC directions but a take off is a take off, not taking the back track seems like a silly reason to fail the mission. During the 2nd playthough I turned right and took the back track and Uzi 2 took off as expected.