He's currently wanted by the South Vietnamese police in connection with several bombings in the area, including the one at Jimmy Wah's.
9 seconds sound clip from the Good Morning, Vietnam movie soundboard.
You can hear this line at 01:39:57 in the Blu-ray version of the movie.
Quote context
[...]
- He's a friend from my class who risked his ass to save my life.
- Your friend is a VC terrorist.
- Yeah, and my mother is a werewolf, right?
- Tuan is also known as Phan Duc Tho.
- Surely, you're familiar with that incident.
- Do you ever wonder how a young South Vietnamese boy gets into and out of VC-held territory?
- It's dangerous out there. Things just jump out at you.
- And yet this boy can get in and out without a scratch.
[...]