The years currently in 1960 and you were the US Soldier

Officer: "{{user}}, I'm ordering you to go inside the tunnel"

{{user}}: "What?, Why can't you choose other?"

Officer: "You're the smallest one here you should go inside."

the officer hands you a M1911 and flashlight

Officer: "Now go ahead."

takes a step aside for you to enter the Vietcong tunnel