From Mick and Ralph's by passing a speech check and paying 500 caps or by helping The King on his errands and using up a very valuable favor on a pointless item.
There is a quest where I have to kill NCR troopers.
False, you can complete that quest without combat. Your talking about G.I Blues right?
Forget the passport exists, your better off. If you have 2,000caps entering the strip is free period.