Call-of-duty-ghosts Access

The phrase "provide an piece" regarding most likely refers to the "Piece of Cake" achievement/trophy, which is earned by completing a specific objective during the campaign . "Piece of Cake" Achievement Guide

: Do not enter the room immediately. Stay behind the doorway for cover.

: Earned by collecting all 18 Rorke Files scattered throughout the campaign. call-of-duty-ghosts

: Your teammates are invincible; let them push forward and finish off any stragglers while you stay safely behind.

: Save all your flashbangs and frag grenades specifically for this room. The phrase "provide an piece" regarding most likely

If you are looking for other "pieces" of the game's completion requirements, you might also be interested in:

: Throw everything you have into the room to clear out as many enemies as possible before they can react. : Earned by collecting all 18 Rorke Files

: Immediately after breaching the common room door with your squad. Strategy :