FURKEY IS HALTING MOST OPERATIONS AT BASES OF ES,
Turkish Govt, holding legal validity for joint defense agreements with US has been lost, announces July 25 it will halt virtually all activities at Amer mil installations starting July 26; acts in retaliation for HR refusal to vote for resumption of arms shipments; says operations may continue only at Incirlik, which houses sqdn of F-4 fighter-bombers, but that it will allow only activities there on behalf of NATO; says Turkish armed forces will take full control of all installations whose activities are being suspended; acts despite personal message from Pres Ford to Premier Suleyman Demirel urging him not to take any drastic action; most important bases, at Karamursel, Sinop and Diyarbakir, are oriented more toward US than NATO defense needs, with prime mission of monitoring Soviet mil activities; Turkey seen under enormous pol pressure to retaliate against arms embargo though it values its NATO membeship and US 'nuclear umbrella'; Foreign Min Ihsan S Caglayangil comments; map (M)