▁field ▁art illery ▁reg iments ▁were ▁dem obil ized ▁at ▁Camp ▁K ear ny , ▁California , ▁on ▁ 2 2 ▁December ▁preced ed ▁by ▁the ▁tren ch ▁mort ar ▁battery ▁on ▁the ▁previous ▁day . ▁ ▁Inter - war ▁years ▁ ▁The ▁ 6 5 th ▁and ▁ 6 6 th ▁Field ▁Art illery , ▁and ▁the ▁ 2 2 d ▁T rench ▁Mort ar ▁B atter y ▁were ▁reconst it uted ▁on ▁ 1 5 ▁October ▁ 1 9 2 1 , ▁in ▁the ▁Organ ized ▁Res erves ▁( present - day ▁Army ▁Reserve ) ▁as ▁the ▁ 3 0 8 th ▁Caval ry , ▁an ▁element ▁of ▁the ▁ 6 2 d ▁Caval ry ▁Division . ▁The ▁regiment ▁was ▁re - formed ▁for ▁the ▁second ▁time ▁on ▁ 1 0 ▁November ▁ 1 9 2 1 , ▁with ▁its ▁headquarters ▁at ▁C umber land , ▁Maryland , ▁but ▁transferred ▁to ▁western ▁Pennsylvania ▁around ▁October ▁ 1 9 2 2 , ▁re loc ating ▁its ▁headquarters ▁to ▁Pitts burgh ▁in ▁ 1 9 2 3 . ▁In ▁ 1 9 2 8 , ▁members ▁of ▁the ▁regiment ▁built ▁the ▁ 3 0 8 th ▁Caval ry ▁Club ▁in ▁Asp in wall ▁on ▁land ▁owned ▁by ▁the ▁local ▁hospital , ▁with ▁e quest rian , ▁p istol , ▁and ▁sab er ▁training ▁areas , ▁as ▁a ▁site ▁for ▁in active ▁training . ▁In ▁July ▁of ▁that ▁year , ▁the ▁regiment ▁conducted ▁its ▁annual ▁summer ▁training ▁with ▁the ▁ 5 2 d ▁Caval