Where to find the access card in Missile Command Delta
Briefly

In Missile Command Delta, the access card is crucial for solving early game emergencies. After repairing the power generator, Marta will be located next to a computer needing an access card. Players should ideally find the access card in their inventory, as it is located above a blue keycard in the Breaker Room. If not owned, players must search the Utility Closet nearby. Using the access card at the computer begins a Missile Command puzzle, leading to further gameplay in the Training Lounge.
Finding the access card in Missile Command Delta is key to solving the emergency that arises early on. While your friend Marta is panicking, it's up to you to save the day.
After fixing the power generator, an alarm will go off. As you hasten back to the central room, you'll find Marta next to a large computer. She'll tell you that the computer needs "some sort of access card."
Before you run off in search of this access card, you should already have it in your inventory, as it was lying on top of the blue keycard needed to solve the generator puzzle in the Breaker Room.
If you don't have it, however, return to the hallway with the power generator and look inside the Utility Closet. The access card is on the desk directly behind the door.
Read at Polygon
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