▁and ▁bomb ard ier ▁also ▁fle w ▁a ▁double - se at ▁air plane ▁across ▁enemy ▁lines , ▁often ▁at ▁night . ▁ ▁Because ▁the ▁Army ▁leadership ▁so ▁tard ily ▁and ▁rel uct antly ▁developed ▁bomb ard ment ▁as ▁an ▁acknowled ged ▁branch ▁of ▁aer ial ▁war fare , ▁it ▁was ▁the ▁last ▁section ▁to ▁be ▁organized , ▁and ▁it ▁initially ▁lack ed ▁most ▁essential ▁equipment . ▁But ▁it ▁was ▁also ▁subject ▁to ▁less ▁pressure ▁since ▁the ▁A EF ▁requested ▁only ▁two ▁bomb ing ▁pil ots ▁for ▁every ▁five ▁purs uit ▁and ▁three ▁observation ▁pil ots . ▁ ▁Class work ▁included ▁the ▁study ▁of ▁organizations , ▁map ▁and ▁comp ass ▁reading , ▁ball istics , ▁phot ography , ▁tact ics , ▁day ▁and ▁night ▁bomb ing , ▁prepar ations ▁for ▁ra id , ▁mini ature ▁range ▁exer cis es , ▁and ▁study ▁of ▁and ▁then ▁actually ▁dro pping ▁dummy ▁and ▁explos ive ▁bomb s . ▁After ▁commission ing , ▁the ▁bomb ard ier ▁and ▁the ▁pilot ▁held ▁equal ▁rank , ▁and ▁both ▁continued ▁for ▁two ▁more ▁weeks ▁of ▁aer ial ▁g unn ery ▁training . ▁ ▁Supp osed ly , ▁all ▁combat ▁air men ▁had ▁taken ▁some ▁aer ial ▁g unn ery ▁instruction . ▁Advanced ▁g unn ery ▁therefore ▁followed ▁the ▁purs uit ▁pilot ▁at ▁the ▁purs uit ▁schools ▁and ▁the ▁others ▁at ▁advanced ▁aer ial ▁g unn ery ▁schools . ▁ ▁The ▁bur den ▁on ▁the ▁Army , ▁as ▁it ▁tried ▁to ▁build ▁the ▁cap ability ▁for ▁advanced ▁training ▁in ▁the ▁United