How about - The soldiers say anything when you kill the last alien? For example
That was the last one
Yeah, We Won
Return to base
How about - The soldiers say something when you hit or kill any alien? For example
Yeah, I got him
Enemy down
Tango down
How about - The soldiers say something when you see an alien? For example
Enemy spotted
Enemy in the building
Enemy in the field
Funny quote - You wanna know how I got these scars? (Joker)