If command calls the platoon and requests "Hunter Two-One", they'll be hailing the unit Hunter Two-One, and will therefore speak to the RTO. If command calls for "Hunter Two-One Actual" they are requesting the acting commander of that unit, as opposed to the unit as a whole (and the RTO).
-"This is Hunter Two-One."
-"No, not the RTO. Hunter Two-One ACTUAL. Just put the lieutenant on the line."
Examples of usage:
wtaf - what the actual fuck
omag - oh my actual god
bffal - best friend for actual life
istag - i swear to actual god
soab - son of an actual bitch
stafu - shut the actual fuck up
Another Actual Person: wtaf???
An Actual Person: istag dylan is a soab!!!
Another Actual Person: omag!!!!!!!!! stafu!!!!!!11