CAMP FOSTER, Okinawa — Two sailors accused of killing a fellow dental technician on Camp Hansen last February have waived their rights to preliminary hearings.Seaman Robert L. Person Jr. of Turrell, Ark., and Seaman Tiffany Marie Brooks of Carthage, Miss., now face separate courts-martial in Keystone Judicial Circuit Court on Camp Foster, according to court officials. Both are charged with murder in the Feb. 2 stabbing death of Seaman Adam J. Palecco, 21.They are also charged with larceny as members of what Marine investigators say was a shoplifting ring.Person and Brooks are assigned to the U.S. Naval Dental Center on...