FEAR IN PENTAGON
Immediate evacuation of 2,800 Amers and 1,200 dependents in Saigon comes under urgent consideration in Washington (DC) as mil and pal situation worsens; Sec Kissinger continues to oppose complete evacuation; Pres Ford sees 'no problem' over his authority to US troops for evacuation, CBS-TV int; adds evacuation of large numbers of S Vietnamese will be 'virtually impossible' without 'sizable mil involvement' if N and S Vietnamese resist US airlift efforts; confirms that 800 Marines are being flown from Hawaii to Western Pacific to 'bring up to strength' US Marine forces currently in area; meets with Kissinger shortly after Thieu's resignation to assess situation; White House press sec Ron Nessen says Ford still believes Cong should approve his request for $722-million in emergency mil aid and $250-million in humanitarian aid; carriers Hancock, Okinawa, Enterprise, Midway and Coral Sea and 2 cargo ships from Mil Sealift Command are to assist in evacuation; Gen Weyand says N Vietnamese troops encircling Saigon 'have capability to overwhelm' S Vietnam, HR Appropriations Com testimony; argues that Cong approval of some emergency mil aid will bolster Saigon Govt, and permit 'some sort of solution short of all-out surrender'; Kissinger testifies at Appropriations Com closed-door session after Weyand's public hearing; describes mil situation as 'very grim' and says 'range of choices is extremely limited'; Sen is expected to approve legis authorizing $200-million for humanitarian aid to country on Apr 22; HR is expected to pass legis appropriating $27-million for humanitarian and evacuation programs; State Dept asserts no concerted plans have been developed for large-scale evacuation of S Vietnamese despite Ford's statements that US wants to evacuate 'tens of thousands': Weyand and Kissinger illus (L)