I noticed not all Space Marines are able to use the "Get Up" command because of their variable names not being in the trigger (Radio Bravo). I think I fixed it; to make it easier to apply to any player in the game instead of adding a line for each variable in the trigger.

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I set the Radio trigger:
Repeatable (checked)
Condition: this
On Activation: null = execVM "standUp.sqf";

standUp.sqf text:

player playMove "AmovPercMstpSrasWrflDnon_AadjPercMstpSrasWrflDup";
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Using "player" here should make it work for everyone, which I know isn't really needed since normal humans and Battle Sisters have prone animations, but I don't think it hurts really.

It seems to work for every player in the game now, including all Space Marines. I tested it and it has worked for me so far.

PS:
My friends and I really like playing these 40k Liberation missions; you did a great job making these. Thank you for your work.