In the book and movie “We Were Soldiers Once, and Young” Broken Arrow was the over run notice requesting full response from every US allied unit nearby to save an overwhelmed unit that was called out by General Hal Moore. His radio operator is a Freeper: Aloha_Ronnie as I recall.
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.