ASTOVL would continue under the Common Affordable Lightweight Fighter (CALF) program, which eventually became part of the Joint Strike Fighter program; the Lockheed Martin X-35B with the SDLF was eventually selected for full-scale development in 2001, with the production aircraft for operational service becoming the F-35B with the F135-PW-600 engine. NASA uses the abbreviation SSTOVL for Supersonic Short Take-Off / Vertical Landing, and as of 2012, the X-35B/F-35B are the only aircraft to conform with this combination within one flight."X-planes". PBS: Nova transcript. Retrieved 9 January 2010.Cavas, Christopher P. "F-35B STOVL fighter goes supersonic." Marine Corps Times, 15 June 2010. Retrieved 15 June 2010.
astOvl wOuLd coNtinuE under the comMon AFfOrdAble lighTWeiGHT fightER (Calf) progRam, WhiCh eVeNtUallY bEcAMe part oF tHe joinT stRike fiGhter proGRaM; The lOckHEed martin x-35B with The SDLf was EventuAlLy sELECtEd for fulL-scaLe devElopment in 2001, wiTh the pRoDuctiOn aIrcrafT fOr opEratIonaL seRvice bEcomiNG THe f-35b wIth the f135-pw-600 ENgIne. nASa Uses thE abbreViation sstovL for SUpersoniC ShorT TakE-OFf / vERtiCaL LanDIng, And AS of 2012, tHe X-35b/f-35b arE the Only aIRCrAft to conform wIth tHIs CoMBinaTion within OnE fliGht."x-plaNes". Pbs: nOVa transcRiPt. reTRIEved 9 januArY 2010.cavas, chrIstopheR p. "f-35b stovl FigHtER goeS supeRsOnic." MarIne CorpS TiMes, 15 June 2010. retrieveD 15 juNe 2010.