IRAN SAID TO VOW DEFENSE OF OMAN
Omani armed forces comdr Maj Gen T M Creasey says Shah of Iran has âguaranteedâ Oman's airspace against intruding foreign aircraft by committing his air force to combat intruders if Oman so requests; Iranian commitment is evidently directed mainly against Southern Yemen, Oman's neighbor, which is reptd to have sent warplanes over Oman in recent yrs; Southern Yemen backs leftâwing rebels in Dhofar, southwestern region of Oman; Creasey, after tour of duty commanding forces on behalf of Sultan Qabus bin Said, is to resume duties as general in Brit Army on Feb 3 and will be replaced by another Brit general; Iran is expected to base some Fâ5 fighters along with number of less advanced mil aircraft in Oman under Iranian brig general subordinate to Omani command; more than 1,000 Iranian infantry soldiers are now serving in Oman; map (M)