When you enter the Infirmary you will see two guards. One of them will have a Assault Rifle and the other is unarmed. Use the NanoMED Health Unit at the far end of the room before confronting the guards.

Go close to the armed guard so you can get him to riflebutt you. This is a good way to learn how to do a Reversal. Hold down the Left Trigger (block) and pull the Right Trigger when he starts his attack. Most times you can get him, sometimes you can't. Don't throw a punch at him or he will use his Rifle. Just back away if you fail to get him in a Reversal and let your health replenish. You'll see that the guard will just stand there. When you are ready to try a Reversal, approach the guard again.

After killing the armed guard, the unarmed guard (a Squad Leader) will come after you. Pull out your Shiv and try to do a Reversal with it.

After killing both guards, you might want to consider redoing the checkpoint over and over practicing Reversals on the two guards here. This may be very useful in the later stages of the game.

After killing both guards, pick up the One-Day Security Card that the armed guard dropped.

Look around the Infirmary. You will see two doors on side of the room. The one with the "1" above it can be opened by the code Shabby gave you. The room is a crude operating facility but it has a Scalpel and.....

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Grab both the Scalpel and the Smokes, exit the operating room, get your Scalpel ready, and open door "2". Behind the door is an unarmed guard. Kill him using the Scalpel and proceed forward. When you turn the corner, you will see a NanoMED Health Station. Use it to increase your health maximum to five blocks.

Climb the ladder nearby and proceed through the door. Go to the crate and crouch. A guard will enter from the far door and will pass by your position. Sneak him and you can get 5 UD from the dead guard.

Go through the door at the far end and enter the Service Hatch to your right. Follow along the hall and you will enter a larger room. The room has an upper level and a lower level. You are on the lower level and two guards will be on the upper level. You can't kill them so sneak your way to the other end of the room.

Follow the hatchway and climb the ladder. Go along the short hallway and crouch through the Service Hatch. You will then enter a larger room similar to the last one except that you are on the upper level. There is also a guard here. Sneak him then make your way to the other end of the room and go through the door.

You will then be on the upper platform above the Courtyard. There is also a guard here. Sneak him and get the One-Day Security Card he drops and go through the door.

You will enter another split level room. You will also see another guard. Sneak him and proceed through the door near the end of the room.

You will then enter a smaller room that will lead you to the.....