Immi officer wrote M.C on my passport

USA F1, F2 Visas - CPT - OPT
1

Hi guys,
I was grilled for a while by the immigration officer in their office when i went through immigration. I got through immigration but the officer wrote M C besides my f1 D/S stamp. What does this mean?

2

Interesting, never heard of anything as such. You may try writing to the CBP office email ID, if you need to know or you can check with DSO as well.