Can you drop off coins at NGC?

Excuse me, I was wondering if I could inquire about dropping off coins at NGC? I've been collecting coins for quite some time and I've heard that NGC is a reputable grading service. I'm interested in getting my collection graded and authenticated, but I'm not sure if they accept direct submissions from individuals like myself. Could you please clarify their submission process and whether or not I can personally drop off my coins at their facility? Thank you for your time and assistance.