The material you are exposed to in the NNPP is classified CONFIDENTIAL/NOFORN. NOFORN = no foreigners. Since you have Panamanian citizenship, that makes you a foreigner, and you are not allowed access to the material.
In other words, you need to be only a U.S. citizen for security clearance purposes.
Your recruiter would love to make you a nuke if he could. He gets bonus points for that.
Your options are to wait for the Panamanian government to allow you to renounce your citizenship or pick another rate that doesn't require you to view NOFORN matieral on a daily basis.