I have three endorsements, RE25 Locksmith, RE35 Electronic Security Technician, RE39 Electronic Security Sales Rep.  Every two (2) years I spend the hours sitting in class to meet the in-service requirements for renewal of those three (3) endorsements. I hear the same material covered in all three classes.  It would be a better use of time if only one(1) four (4) hour class covered the required material to meet the in-service requirements for renewal.