▁the ▁United ▁States ▁Army ▁from ▁ 1 9 1 7 ▁until ▁ 1 9 4 2 . ▁In ▁September ▁ 1 9 1 8 , ▁it ▁was ▁converted ▁into ▁the ▁ 6 5 th ▁and ▁ 6 6 th ▁Field ▁Art illery , ▁and ▁the ▁ 2 2 d ▁T rench ▁Mort ar ▁B atter y . ▁The ▁units ▁were ▁station ed ▁at ▁Camp ▁K ear ny , ▁California . ▁Although ▁dem obil ized ▁in ▁December ▁ 1 9 1 8 , ▁they ▁were ▁re - formed ▁and ▁re - pur posed ▁in ▁October ▁ 1 9 2 1 ▁as ▁the ▁ 3 0 8 th ▁Caval ry , ▁an ▁element ▁of ▁the ▁ 6 2 d ▁Caval ry ▁Division . ▁During ▁World ▁War ▁II , ▁it ▁was ▁dis band ed ▁again . ▁In ▁ 1 9 5 9 , ▁the ▁regiment al ▁headquarters ▁was ▁transferred ▁to ▁Department ▁of ▁the ▁Army ▁control . ▁ ▁World ▁War ▁I ▁ ▁The ▁ 3 0 8 th ▁Caval ry ▁was ▁constit uted ▁on ▁ 1 8 ▁May ▁ 1 9 1 7 , ▁in ▁the ▁National ▁Army ▁and ▁organized ▁on ▁ 2 4 ▁February ▁ 1 9 1 8 , ▁at ▁Camp ▁Harry ▁J . ▁Jones , ▁Arizona . ▁The ▁regiment ▁was ▁broken ▁up ▁on ▁ 1 3 ▁September ▁and ▁its ▁men ▁were ▁used ▁to ▁create ▁the ▁ 6 5 th ▁and ▁ 6 6 th ▁Field ▁Art illery , ▁and ▁the ▁ 2 2 d ▁T rench ▁Mort ar ▁B atter y . ▁The ▁two