You'd be surprised. I'm not familiar with how micron operates, but I've worked at one of their competitors; there's a lot of jobs in maintenance and facilities support. The big hangup, IMHO, is that there's typically a 2yr degree / military background requirement, so it's harder to just go into the field.

My department, for example, was on the middleish size, and was staffed to have about 56 full time shift workers, outside of the non-management engineering staff.