Vignale, thanks a lot.

The Specialist: My friend has already left Qatar, and he didn't need NOC for that. The question was whether he could enter Qatar again without NOC, considering that the purpose of his visit would be just vacations or stopover on the way to another country. But I understood from Vignale's reply that he would still need an NOC from the previous Company to re-enter Qatar within 2 years after he left regardless of the purpose of his visit.

Anyway, thanks to everybody for answering.