How many years after forming did the 279th Independent Shipborne Assault Aviation Regiment become a Maritime Assault Aviation Regiment?
return the  forming of the 279th Independent Shipborne Assault  Regiment ;return the  279th Independent Shipborne Assault  Aviation Regiment did become a Maritime Assault Aviation  Regiment  ;return year of #1 ;return year of #2 ;return difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']