Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: A cikin 1934, Rundunar Sojojin Amurka ta ba da buƙata don mai jefa bam tare da nauyin bam sau biyu da kuma zangon Martin B-10, wanda kawai ya shiga sabis a matsayin mai jefa bam na Sojojin. A cikin kimantawa a Wright Field a shekara mai zuwa, Douglas ya nuna DB-1. Ya yi gasa tare da Boeing Model 299 (daga baya ya zama Boeing B-17 Flying Fortress) da Martin Model 146.  Tambaya: Wanene abokin hamayyarsu?
Boeing Model 299 (daga baya ya zama Boeing B-17 Flying Fortress) da kuma Martin Model 146