2011年1月26日，美国德克萨斯州，最后一架 F-35B“闪电”II 系统发展与验证机（编号：BF-05）在沃斯堡联合后备基地海军航空站首飞。结束系统发展与验证机阶段之后，F-35项目将进入低速率初始生产阶段。（The last Lockheed Martin [NYSE: LMT] F-35B Lightning II assigned to developmental flight testing departs Naval Air Station Fort Worth Joint Reserve Base on its first flight Thursday. Known as BF-5, the short takeoff/vertical landing (STOVL) jet will ferry to NAS Patuxent River, Md., later this year, where it will join four F-35Bs and one F-35C carrier variant aircraft currently undergoing testing.）