The Radio Communication Systems Endorsement is now available in PSI/LaserGrade test centers. In order to take the RCS exam you must:
1) be AET certified, you will need your AET card when you take the exam 
2) fill out the pre-registration form
3) make your appointment with PSI/LaserGrade after you receive your authorization number.

This exam is 50 questions and you will have 1 hour to take the exam. Cost for this exam is $70.

Pre-Registration Form 
Radio Communication Systems Standards