..... The service is looking at an initial order of about 20 aircraft for
　　the OA-X mission a early as next year, with serious procurement
　　launching in Fiscal 2018,.....
なんだからスコーピオンは兎も角、RFPさえまだなT-XでOA-Xは無理
普通に考えたらアフガン向けに採用済みのA-29で決まりだろう

USAF seeks two new close-air support aircraft
24 July, 2016 - Flight Global
ttp://www.flightglobal.com/news/articles/usaf-seeks-two-new-close-air-support-aircraft-427769/