PentagonSeeks To Halve Plan For Warships
Pentagon, with Pres Carter's approval, proposes to slash by more than half Navy's plans for bldg new warships over next 5 yrs; proposal would dash Navy's hopes to enlarge fleet from current 462 to 600; Secs Brown and Claytor brief key Sens and Reprs on plan; Brown, in Jr, tells Cong that plan would yield growing naval force in '80s and would be adequate to cope with Soviet Navy, although assessment is challenged privately by several Navy officials; reductions noted; Carter's 5-yr plan and earlier 5-yr plan detailed (M)