Keycards

Not to be confused with ID cards or group rankings, Key cards are the items in the game that are used to simply open doors. Each team has a different keycard that it gives when you spawn. Level-1 cards give the lowest clearance, while L-5 gives highest.

L-1
L-1 key cards have very many uses, despite being the lowest level. These cards can open most LCZ containment areas, along with the LCZ-EZ checkpoint gate.

L-2
L-2 keycards are commonly used by SD and MD. These cards can open no or almost no doors from the L-1 classification.

L-3
L-3 cards are found throughout the facility on tables or shelves and are the choice of the un-official R&E members. These cards are a minor upgrade from L-2 and L-1, now just being able to open a few more storage rooms.

L-4
L-4 cards are used by the MTF unit B-7. While it can only open a few more doors, it is considered a major upgrade from the previous ranks. This card is the first card that can open gates like Gate A and Gate B. It can also open several HCZ rooms, despite not being able to get into the HCZ itself.

L-5
L-5 cards are the highest ranking card in the game, and can open practically every door in the game too. It is used by IA, EC, AD, and almost every other high-ranking department in the game, including MTF units (but not B-7). This card can open the HCZ and about every single room in it, too. It can open elevators to get to the checkpoint observation areas, meeting rooms, gates, etc. This card is commonly abused by IA to let people in these rooms and cause havoc.