Significance of WWII-era wartime worker ID badge?

My awesome coworker brought this amazing poster in!  We are wondering about the significance of the id badge?  Looks like a series of numbers and letters. Thoughts?

whitney snyder

? ? ?

Dear Ms Snyder,

The badge is just what it seems to be: an identification badge, with photo and ID number, as well as assigned factory.  During wartime, anything as vital and vulnerable as an ordnance plant wanted to keep track of its workers—and make sure that no saboteurs slipped in.

An example of one such ID badge, for the Redstone Arsenal, is shown at the bottom of the attached thread: 



Jon Guttman
Research Director
World History Group

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