Note: The list of possible binary codes includes:
11000
11001
10100
10010
10011
10001
01001
00101
00011
When playing as Ghost, and after you have just shot off the plane's tire, you will encounter the agent chopper. Change your weapon from the M95 Sniper Rifle to the SG - 552. Immediately stand almost as far back as you can go from your current position, so that you are not too close to where the chopper will appear. The moment you see it, use Focus and fire at the same time. The chopper should take major damage, but will leave your health at a minimum of about 20% before backing off. It will then try to attack you from the right; turn about 90 degrees to your right and get ready to blast it with the remaining ammunition. Make sure you that you do not stay too far back, because your shots may have less chance of hitting. You may get killed here if your reflexes are not fast enough. Also, if you defeat the chopper you may be left with just 1% health, but this is enough to get you out of there, let you save your game, and continue the war to save Zion.