The Aurora Aircraft is a good reason.To the poster who brought up the retirement of the SR-71. The plane was retired not because of politics or cost, but because of Satelites. Even back then, 80's, a U.S. spy satellite could take a clear picture of me flipping it off. Also, their have been rumors, can't confirm, that the SR-71 was retired because of the Aurora aircaft (offical aircraft name?)...Flying at Mach 5+.
Forget the F-22/35 and PAK-FA. If you wan't unmatchable stealth, go with an UCAV's package. Stealthier, Loiter longer, Doesn't get tired, pull
s higher G's, .ect. My bet is the X-45/47. Jesus, I would love to know what they are flying now, in the Southwest U.S.
But I think the real reason the SR-71 was retired was because, it a serious Gas Guzzler, there were problems with keeping it up in the air long enough for the SR-71 to be able, to conduct a successful operation, in the 90's, when there were more advanced options such as satellites and high speed UAVs