Because of an editing error, an article yesterday incorrectly described a $75 million U.S. aid package to the Philippines. The expedited aid is part of $250 million in economic security assistance for the Philippines appropriated for fiscal 1987, which ended Sept. 30. (Published 10/31/87)

The Reagan administration, which already has rushed $35 million in military assistance to the Philippines this year, announced yesterday that it is expediting $75 million in additional aid as part of its continued strong support for the besieged government of President Corazon Aquino.

At the same time, Rep. Stephen J. Solarz (D-N.Y.), chairman of the House Asia subcommittee, said in an interview that he plans to push for a major increase in U.S. assistance to the Aquino government.

"I'm thinking in terms of $5 billion over the next five years," he said, adding he hoped Japan and other Asian nations would match this amount, for a total of $2 billion a year for the Aquino government.

Solarz said he was discussing his proposal with Sen. Alan Cranston (D-Calif.) and Sen. Richard G. Lugar (R-Ind.), who have been conferring with administration officials on the idea of launching "a Marshall Plan for Manila."

At a news conference in Manila yesterday, Undersecretary of State Michael H. Armacost said the $75 million in aid was a "very concrete and tangible way" of showing the administration's "undivided support" for Aquino.

Responding to Manila critics who questioned the administration's commitment to Aquino, Armacost said more U.S. aid had gone to the Philippines in the past 20 months than during the last five years of then-President Ferdinand Marcos' rule.

He said the administration planned to announce this weekend new economic development aid and a plan for quicker disbursement of unspent U.S. funds. Armacost's visit coincided with the killings Wednesday of three American servicemen near Clark Air Force Base.

It was the first time Americans have been targeted for assassination in the current political turmoil there, and State Department and Pentagon officials continued yesterday to express extreme caution in reaching any conclusion about who may have been behind the murders.

"We're still not pointing the finger at anybody," said Defense Department spokesman Robert S. Prucha.

Prucha said the Pentagon had received "conflicting information" about the slayings and has not been able to confirm whether the communist-led New People's Army (NPA) was responsible, as an anonymous tipster suggested in a telephone call to a foreign news agency in Manila yesterday.

Visiting Philippine Vice President Salvador Laurel asserted yesterday in a meeting with editors and reporters of The Washington Post that it appeared the NPA was behind the attacks.

"This is it," he said. "As far as the communist rebels are concerned it's really all-out war."

Laurel said he thought the NPA had decided to go after Americans now because of recently stepped-up U.S. arms deliveries to the government.

Administration officials have been extremely reluctant to conclude that the NPA has decided on a basic change in tactics toward the big American military and civilian presence in the Philippines. This includes nearly 39,000 civilian and military personnel and dependents at Clark Air Force Base and Subic Bay Naval Base.

There has long been a kind of tacit understanding that the NPA would not target Americans provided the United States does not become more deeply involved in the government's counterinsurgency campaign.

Some U.S. analysts of the convoluted Philippine political scene think the assassinations, which were carried out in the hit-and-run style of NPA killer "Sparrow" squads, may have been the work of forces loyal to Marcos.

"The Marcos people have the means and methods of doing this," said Richard J. Kessler, senior associate at the Carnegie Endowment for International Peace. "{They} are trying to send us a very powerful signal to stay out of Philippine politics."

Kessler, who has studied the NPA closely, said he doubts that the the United States is sufficiently involved yet in the counterinsurgency campaign to lead the communist guerrilla leadership to target Americans for assassination. "The preconditions have not been met yet," he said.

Meanwhile, a State Department official said yesterday U.S. aid to the Aquino government totaled $484.7 million in fiscal year 1986 and $471.8 million in 1987, already more than the $900 million target for administration aid to the Philippines in 1984-89.