How do you get the id card in Metal Gear Solid peace walker

To obtain the ID card needed for access to the lab you must first battle the Pupa. After that Huey Emmerich will give his to you. But when you actually get to the lab the lock won't accept the Card. In the next mission you will need to go back and find a enemy soldier wearing a orange vest or jacket. A distinct bird call will be heard if he is in your area.