65.33—Eligibility requirements: General.
         To be eligible for an air traffic control tower operator certificate a person must—
    
    
    
    
        
        (c) 
         Be able to read, write, and understand the English language and speak it without accent or impediment of speech that would interfere with two-way radio conversation;
    
    
        
        (d) 
         Except for a person employed by the FAA or employed by, or on active duty with, the Department of the Air Force, Army, or Navy or the Coast Guard, hold at least a second-class medical certificate issued under  part 67 of this chapter within the 12 months before the date application is made; and