In the beginning of the Defense Ministry mission, after you have gone through the first room and are in the hallway with the two guards (one patrolling, the other on the left side of the hall facing away from you), crouch and sneak into the shadows on the left side of the wall. Go into the room on the left, behind the stationary guard. Walk straight through the door, then up the wooden planks. There will be a medkit on the wall -- take it. Turn back towards the wooden planks and look up. You should see a metal girder. Get close to the wall on the left and do a double jump to get on that girder. Once standing on it, there should be another girder in front of you. Jump and get on it. Then, turn around and you should see yet another girder. Jump on it. Directly in front of you should be a medkit and a disposable pick on a well lit platform. Jump to it, pick up the items, and turn around again. Run to the girder (you do not have to jump). If done correctly, you should grab onto it. Release the girder and immediately hold Left Analog-stick Up to grab the next girder down.