Driver mech would be Driver Mechanic, which was shortened to D&M by the 1970s.  Rather than just operate the controls, the soldier was expected to do 1st line maintenance too.
		 
		
		
		
		
		
		
			
				__________________ 
				Terry Warner 
 
- 74-????? M151A2  
- 70-08876 M38A1  
- 53-71233 M100CDN trailer  
 
Beware!  The Green Disease walks among us!
			 
		
		
		
		
		
	
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