 Horne's tour as COMAIRBATFOR was marked by Fleet Problem XVIII, one in a series of annual fleet exercises that developed and tested naval doctrine between the wars.In one early simulation, Horne faced off against King in a simulated air assault on San Diego, California.Horne's carriers, USS "Saratoga" and , were tasked with attacking the city, which was defended by King's shore-based patrol planes and the aircraft of the carrier .