Interesting. Why is this?
Difference in culture regards the guy in back.
The only AF tactical two-seat aircraft I can think of off the top of my head that didn't have dual controls, are the EF-111A Raven due to the ECM package installation on the EWOs side of the cockpit. Funny, since the F-111 fighter/bomber had full dual controls, but for the EF-111, they removed the stick and rudder pedals, but left the throttles in place. The other aircraft without dual controls were the F-89 Scorpion, the F-94 Starfire, and the F-101B Voodoo.
On the culture thing, the Navy has seemingly been of the thought that the NFO is one who does everything but fly, as thats the aviator's job. And as such, have designed their aircraft to be able to only do that. The USAF has liked the idea of dual redundancy, not only for safety, but for convenience. Many WSOs in aircraft like the F-4 and EWOs in F-105s were fully proficient in air-air refueling, could likely land the aircraft in the event of an emergency (with exceptions), and could simply just take the stick to give the pilot time to relax. I say "with exceptions" because I remember in the USAF F-4, the rear seat had only emergency gear extension, and no ability to drop the tailhook for an arrested landing on a runway. I also don't think there were flap controls back there either, but can't remember specifically.
Other aircraft, like the F-4G Weasel and F-105G Weasel planes, had instrument panels in the rear cockpit that went to the top of the canopy, so even with dual controls, they were considered a single-pilot aircraft due to the non-existant forward visibility. In fact, to legally shoot a practice instrument approach where the rear seat Nav could play safety pilot in the normal F-4s and F-105s; in the G models of each of these, there had to be a wingman chase as safety pilot.