SAIGON — Allied forces in the Republic of Vietnam Monday wound up two major operations and were expecting to end another. Enemy deaths were expected to total more than 2,000.

In Operation Utah, a bitterly fought battle by U.S. and Republic of Vietnam troops against a north Vietnamese regiment, the official body count was set at 533 late Monday and was expected to soar to nearly twice that figure when the final count is in.

The Allied troops met little resistance Sunday night and Monday and have begun to pull out of the area.

in Saigon, U.S. officers involved in the operation gave newsmen a complete rundown on the sweep. They were Army Col. Bruce Jones, senior adviser to the 2d Army of Vietnam (ARVN) Div., Col. O. F. Peatross, commander of the 7th Marine Regt. and head of Task Force Delta, the U.S. forces involved in the drive, Marine Col. William Johnson, in charge of air support for the battle, and Army Capt. Peter Dawkins, former West Point football hero who is now adviser to the 1st Vietnamese Airborne Div.

Jones, describing events leading tip to the operation, which involved some 5,000 U.S. and ARVN troops, said that as early as Feb. 7 reports based on questioning of two captured north Vietnamese soldiers indicated there was a large enemy force in the area.

Later reports, from other captured guerrillas and from local intelligence sources, put the number of north Vietnamese troops at some 2,000 and placed their headquarters in a village12 miles northwest of Quang Ngai City, Jones said.

As soon as that data was confirmed, the Allied forces moved in.

Peatross described how the Vietnamese and Marines moved with precision Friday and Saturday into positions ringing the enemy.

Many of the troops — those nearest the Red village stronghold — ran into heavy fire as soon as they landed from helicopters, he said.

But they held their ground and during bitter fighting pressed forward to close the circle on the trapped north Vietnamese.

The Reds, Peatross said, were well equipped with Chinese-made arms and well dug in to bunkers, trenches and spider holes.

Fighting raged throughout the night Saturday and all day Sunday. It dwindled Sunday evening and there was little contact Monday.

Air support added greatly to the success of the operation.

Johnson said his helicopters flew 2,754 sorties (each aircraft in a flight constitutes a sortie), ferrying 6,305 troops and 137 tons of cargo to the battle zone. At times, pilots ran into intense ground fire.

The fire was so bad at one point. Johnson said, that friendly troops on the ground waved the copters off.

Two helicopters were downed by enemy fire. One was recovered but the fate of the second was not immediately known.

Fighter aircraft blistered enemy fortifications with napalm and pounded them with bombs and rockets.

Johnson said that, all told, the enemy was hit with 308,000 pounds of napalm and other high explosives.

One plane was lost, but its pilot was rescued.

Dawkins said the Viet Cong attacked his Vietnamese unit as soon as it landed and that the fighting raged for hours.

"We had half a hill and the VC had the rest," he said. "Most of the time during the night our front lines were only about 10 meters apart."

All in all, the officers said, the battle was a sparkling success. The Allies broke the back of what was identified as the 21st (or in some data, the 36th) north Vietnamese Regt., which they had been hunting for months.

They came up against well-trained troops, entrenched in sophisticated fortifications and outfitted with an impressive array of firepower.

A U.S. spokesman said friendly casualties in the operation — considering the number of troops involved — were light.

In other ground action:

— Operation White Wing, the huge Allied sweep of the rice-rich area around Bong Son, ended Sunday with a total of 1,484 enemy dead, 536 captured and 1,568 suspects detained.

The U.S. 1st Air Cav. Div. accounted for 1,268 of the guerrilla dead in the drive, which began Jan. 25, and Republic of Korea troops added another 216. Friendly casualties were described as light.

— The 1st Inf. Div. Sunday wound up Operation Cocoa Beach, 35 miles north of Saigon, with 199 enemy killed and 10 captured.

— Paratroopers of the 101st Airborne clashed Monday morning with an unknown number of Viet Cong. The brief battle ended with five VC dead.

Elements of the 101st killed six guerrillas Sunday. Friendly losses in both actions were light.