Utahns with an interest in modern military history may want to plan a trip to New Mexico Oct. 1, when the site of the world's first atomic bomb explosion - the Trinity Test - will be open to the public.

It is one of two days a year when the national historic landmark is open.The site of the July 16, 1945, detonation is open every year on the first Saturdays in April and October. It is ordinarily closed because it's at the northern end of the 3,200-square mile White Sands Missile Range, which is an Army installation where missiles and bombs have been tested.

The area is heavily used for testing and other projects, said Don Montoya of the White Sands public affairs office.

The Trinity site is between the towns of Carrizozo and Socorro, N.M. Visitors can enter the range's Stallion Ranger Center, five miles south of U.S. 380, between 9 a.m. and 2 p.m.

"Visitors arriving at the gate between those hours will receive handouts and will be allowed to drive unescorted the 17 miles to Trinity Site," said James Eckles, another public affairs officer for the missile range. "The road is paved and marked."