Task: Question Generation
Input (English): #1 return Krulak assumed duties as the  commanding general ,  2nd Marine Logistics Group Group/Commanding general  ,   6th Marine   Expeditionary Brigade , Fleet Marine  Force Atlantic 
#2 return Krulak was  assigned duty as assistant deputy chief of staff for manpower and  reserve affairs 
#3 return month of #1 
#4 return month of #2 
#5 return the  difference of #4 and  #3
Output (English): How many months after Krulak assumed duties as the commanding general, 2nd Marine Logistics Group Group/Commanding general, 6th Marine Expeditionary Brigade, Fleet Marine Force Atlantic was it before he was assigned duty as assistant deputy chief of staff for manpower and reserve affairs?