ORIGINAL: Canoerebel
John has been using some Nicks lately on small raids (sweeps, I think) against Luangprabang, where they keep bumping their heads against some good Spit VIIIs.
Formosa is now loaded with fighters, but few strike aircraft. I'm thinking John is preparing for the inevitable 4EB assault, but I'm waiting to get Aparri, so that my sweeps will be at a reasonable range. (All those fighters could be kamikazes, but more likely there for CAP). Okinawa also has a lot of fighters.
It's entirely possible that he's having them on ground or airfield attack, but with drop tanks... in which case they'll fly the mission trying to bomb without having any bombs, and so they show up as "sweeping."
I've done this a lot with Beaufighters, even though it says in-game they'll fly with bombs.