For those wondering about buying reinforcements and whether or not discarding a token counts as an action - specifically Eva's Iron Cross and MacNeal's Silver Star - here's your answer:
Discarding a token is not an action, but it must take place during the character's activation. For example, upon activating Eva she can discard her Iron Cross 1st Class to add 2 CPs to the Reich's CP pool, then move and attack (or any combination therein).
This means you can't purchase reinforcements in any game mode that only refreshes 2 Command Points per turn (i.e. Death Match and Capture the Flag) as you could never acquire 3 CPs at the start of your turn/prior to activating any of your characters.
[Edited to reflect the new information provided by spacemonkeymafia.]