The General Atomics ID card is a miscellaneous item in Fallout 4. The card is needed to ID yourself to the Director and get the General Atomics Galleria re-opened.
An ID card, belonging to Mr. Kincaid pre-War.
In the General Atomics factory, on a desk in an office on the second floor underneath a battered clipboard. From the entrance, go up the staircase and the office is the first door on the right.