[QUOTE=tugsailor;76545]…I do not believe that a lost TWIC invalidates a MMC. …[/QUOTE]
While you have to hold a TWIC to be issued an MMC, loss of the TWIC does not invalidate the MMC. The MMC can only be invalidated by its expiration or a suspension or revocation. No longer having the TWIC might be cause to bring an action for suspension or revocation, but in this scenario where you have applied for a replacement, it’s extremely unlikely one would be brought.
Transiting a terminal is not the only reason a TWIC might be needed. If your vessel has a secuirity plan and has designated secure areas, you need a TWIC for unescorted access to those spaces on the vessel.