Oh yes, the Infantry RTO in Vietnam had a life expectancy of about 5 minutes in a firefight.
The enemy knew to shoot the radio carrier first if they didn't want arty or CAS bombing them.
The movie it seemed followed that line of history quite well, I remember seeing just about every radioman but the commanders get shot in that movie during the firefights.
I remember Aloha_Ronnie, a real classy guy.