This mission says it can be completed as many times as you want however, #/50 times you've done the mission.

Does anything special happen if you do it 50 times?

nope you dont get nothing extra once complete. It just resets to Zero again.
You dont even get mission tier credit.

I understand that it is a looping mission to be done over and over but I really think you should get Tier credit after the first time complete

Thanks, that is a little weird. Seems like an unending counter would be make more sense than one that counts to 50 and then resets.