well, if your friend came here under nepal government funding or fulbright or eastwest fellowship and has 2 years of home residency requirement, its very difficult to get no objection letter.  no objection letter will be send by our nepal embassy in DC. 

if your friend came here in self finance, then he should be able to get one from embassy.  i believe they will send this no objection letter directly to the office who has requested it.  should be sealed.