The Advanced Day Fighter concept, renamed F-XX, gained civilian political support under the reform-minded Deputy Secretary of Defense David Packard, who favored the idea of competitive prototyping.
"Advanced Day Fighter" ("Avanceret dagjager") konceptet blev omdøbt F-XX, og fik stigende civil politisk støtte under den reformvenlige viceforsvarsminister David Packard, som foretrak ideen om konkurrerende prototyper.