Excess slots?

So I’ve recently just got back from MEPS for a physical, and the next time I go back, I swear in since I need medical documents and waivers approved. My slot for my MOS is being held within 10 days, but my recruiter mentioned something about an “excess slot” but I don’t know what that means.

So I’ve recently just got back from MEPS for a physical, and the next time I go back, I swear in since I need medical documents and waivers approved. My slot for my MOS is being held within 10 days, but my recruiter mentioned something about an “excess slot” but I don’t know what that means.