301-11.3—Must my agency pay an allowance (either a per diem allowance or actual expense)?
         Yes, unless:
    
    
        
        (a) 
         You perform travel to a training event under the Government Employees Training Act (5 U.S.C. 4101-411 8), and you agree not to be paid per diem expenses; or
    
    
        
        (b) 
         You perform pre-employment interview travel, and the interviewing agency does not authorize payment of per diem expenses.