F-35 alternative engine "unnecessary" & "unwanted"

A quarter-page ad in the "A" section of today's Washington Post highlights the cost of the "alternative engine" for the F-35 Joint Strike Fighter that is currently being argued over in the Congress. The key argument in the ad is that one "unwanted, unnecessary alternate engine" for the F-35 would cost the same as 53 Joint Strike Fighters.
The ad quotes a March 2007 GAO report that puts the price of this engine at $7.2B.
Some of us agree that the engine is unecessary, and hope that the Obama Administration does veto it if the Congress insists on trying to fund it.
Of course some of us think the F-35 is "unnecessary", too...especially at a cost of up to $1T!