Escaped MissilecRips Into DesertTRONX. (INS) An unarmed Navy Regulus II missile escaped from radio control yesterday and crashed harmlessly on the Mojave Desert with a •'tremendous' explosion that sent up a mushroom-shaped cloud.The explosion jarred a wide area of desert communities near the Navy's Ord- caIt of Trona, which was badly nance Test Station B Range, by ihe explosion,but the Navy announced off*- RcsWontlt;; of Trona anri dally several hours after the; Rjdgccrcsl about 20 miles crash that the blast was caused|sou-hNVCSl oJ Tlt)Jia deScribedp:iliP‘the explosion as '•tremendous.” There were no immediate reports of concussion damage, however.Ridgecrest residents also reported seeing a miniature cloud with the familiar mushroom shape of an atomic bomb cloud arising from the }ointsolely hv the missile's fuel., The groiiiuMatiiiched niis-[ site hud no warhead, the | Navy said, nnd the crash j caused no Injuries or 'prop-j erty damage.| The official announcement i followed the crash by some i five hours.I The Navy Public Information!of the detonation, j Office in Los Angeles reported; *C0PT1£US HOVER that the missile had been: Trona residents said theylaunched from Edwards Air.saw helicopters hovering over [Force Base, about SO miles,the explosion area, southwest of the crash area,; Offici;ils at the Naval Ord-uuder radio control. (nance Station at China Lake,Ordinarily, .such test missiles; just west of Trona. disclaimed arc brought safely buck to any knowledge of. the ox pineal'til without incident, ihe:sion.Navy said, but in this easel The Armed Forces Public there was a “sudden control:Information Office said it was; failure” j checking all reports.The Navy stressed that the| Residents of the general missile-was not a runaway.;vicinity of Trona and Ridge-The official announcement said crest are accustomed in hear-the reasons for the tnish are!the Mojave B Range, but they under investigations by naval'were virtually unanimous inauthorities.i describing the blast as the larg-The missile was completely jest ever heard there, destroyed in the crash. * j Trona officials, however. The scene of the crash was i were reluctant to say anything pinpointed at two .miles eastjat all about Ihe explosion, pre-of Searles Dry Lake, just within the confines of the ordnancesumably because the Navy has shrouded its activities in thetest range and only a Jew miles' resec