Secret Service

The end of this level (from the final checkpoint to the end) is infuriating on POTUS Detail because of the laser mines. Fortunately, there are two grenades hidden in the tunnel to the right of the gate that opens right after hacking the computer. Enter the tunnel directly across from the computer hack platform, go left, then turn right and creep up to the laser beam without tripping it. Grab the grenades and use them to clear out the laser mines from the final room.