Training
The Keypad Door: 28469

Mission 1, Police Station
Blaustein's Balcony Door: 091772

Mission 2, Defense Ministry
No keypad doors
Mission 3, Oil Refinery
No keypad doors

Mission 4, CIA HQ
Technical Services Room: 7687
Battery Generator Backup Room: 110598
Storage Room: 2977
Main Server Room: 2019
Weapons Testing Department: 110700
West Entrance to Information Retrieval: 0614

Mission 5, Kalinatek
Security Door: 97531
Archives Department: 33575
Back Door on Third Floor: 1250

Mission 6, Nuclear Power Plant
Cooling Rod Control Room: 560627
Door to Maintenance Shaft: 151822
Maintenance Shaft: 795021

Mission 7, Chinese Embassy
No keypad doors

Mission 8, Abbotoir
Door to Ceiling: 770215

Mission 9, Chinese Embassy
Door to Hall: 1423
Door at Back of Warehouse: 1456
Door to Elevator: 7921
Door to General Keirong's Office: 1836

Mission 10, Presidential Palace
Garden Gate: 2126
Door to Corridor: 70021

When using the manual lockpick, instead of rotating it slowly as the game suggests, press the stick in one of the four diagonal corners, as the "rumble" will always be in one of those directions.

To read the heat signature on a keypad, you can either walk up to the keypad and look at it with the heat goggles on, use sniper mode at a distance with the heat goggles on, or activate the keypad and turn on your heat goggles there. The order of the buttons is based on color: Deep Blue, Blue, Light Blue, Green, Light Green, Yellow, Orange, Red. For example, if you had a Deep Blue button at 1, a Light Green button at 3, a Light Blue button at 4, and an Orange button at 6, the code would be 1-4-3-6.

In the Training Stage, after you complete the task of looking at the lights, go over to the left or right. You will be above the lights and should find two doors. On the right is a door that leads to a room where a lock pick is sitting on the shelf. You can use this to get into the other door leading to the covert-ops section of the training. After entering this room and getting the keypad code (5656), you can then go left and get into the doorway to the left of the start of the level. You'll find two rooms. In the last room is Anna Gromsdottir. You can talk to her about different things, but DON'T hit her because you will be fired!