▁Tem por ary ▁flying ▁field ▁ ▁P urs uit ▁School : ▁Advanced ▁flying , ▁ 6 - week ▁course ▁ ▁Reserve ▁Military ▁A vi ators ' ▁Con cent r ation ▁School ▁Ind o ctr ination ▁Training ▁ ▁Cl osed , ▁May ▁ 1 9 1 9 ▁▁ ▁Post ▁Field ▁ ▁Fort ▁S ill , ▁Law ton ▁Oklahoma ▁▁▁▁▁▁ ▁N amed ▁after ▁ 2 d ▁Lieutenant ▁Henry ▁B . ▁Post ▁▁ ▁Const ruction ▁started ▁ 8 ▁August ▁ 1 9 1 7 , ▁training ▁began ▁January ▁ 1 9 1 8 ▁ ▁P erman ent ▁flying ▁field , ▁located ▁on ▁military ▁res ervation ▁of ▁Fort ▁S ill . ▁ ▁Bal lo on ▁School : ▁for ▁the ▁training ▁of ▁bal lo on ▁organizations ▁and ▁bal lo on ▁obser vers ▁ ▁Observ ation ▁School : ▁ 5 - week ▁course ▁for ▁obser vers , ▁ 4 - week ▁course ▁for ▁pil ots ▁ ▁Radio ▁School : ▁Advanced ▁course ▁for ▁radio ▁te legraph ▁officers ▁▁ ▁Rich ▁Field ▁ ▁W aco , ▁Texas ▁▁▁▁ ▁N amed ▁after ▁ 2 d ▁Lieutenant ▁Perry ▁C . ▁Rich ▁▁ ▁Const ruction ▁started ▁ 1 1 ▁September ▁ 1 9 1 7 ; ▁flying ▁began , ▁ 1 ▁December ▁ 1 9 1 7 . ▁ ▁Tem por ary ▁flying ▁field , ▁Primary ▁F lying ▁School : ▁ 8 - week ▁course ▁ ▁Cl osed , ▁May ▁ 1 9 1 9 ▁▁ ▁Rock well ▁Field ▁ ▁San ▁Diego , ▁California ▁ ▁Pre - World ▁War ▁I ▁F lying ▁School , ▁established