During Warzone matches, you will earn Energy by killing enemies, capturing objectives, and killing AI bosses. On the bottom your HUD, you will notice a small green meter with numbers on either side; this is the Energy Level progress bar. Each time you reach a new Level, you will gain 1 Energy Point and Spartan Palmer will announce, "Level [X] REQs available".
Once Level 5 (or higher) REQs are available, you can call them in - provided you have, of course - by visiting REQ Stations around the Warzone map, or by opening the REQ Station manually during the respawn screen. You can easily tell the level of a Requisition by the large number on the face of its card in this menu. Once you choose any Level 5+ REQ, confirm your purchase and the achievement will unlock.
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