How many years after the 1st Squadron, 10th Cavalry went to the Republic of South did it received its first Valorous Unit Award?
return the  1st Squadron 10th Cavalry went to the Republic of South ;return it received its first Valorous Unit Award ;return year of #1 ;return year of #2 ;return difference of #4 and  #3
['select', 'select', 'project', 'project', 'arithmetic']