The 1457th Engineer Battalion of the Utah National Guard and six units under the battalion were alerted Tuesday of a possible call to active duty for as long as 12 months.

If activated, the call-up would be the largest to hit the Utah National Guard since the Aug. 2 invasion of Kuwait by Iraq, and the second-largest overall in Utah of reserve component troops.Some 708 people in seven Utah communities would be affected if the battalion is called up, said Maj. Bob Nelson, Utah National Guard spokesman.

The 1457th has its headquarters in American Fork, where 185 people would be affected. Units under the battalion that have been alerted, their locations and number of personnel are:

-Company A, Price, 80; a detachment under Company A, Blanding, 51.

-Company B, Murray, 123.

-Company C, Provo, 127.

-Company D, Mt. Pleasant, 85; and a detachment of Company D, Nephi, 57.

When a unit is alerted for a possible call to active duty, military personnel must be accessible and keep in contact with their unit. Every Guard unit alerted to date from Utah as a part of Operation Desert Shield, now Operation Desert Storm, has been activated. They include five Army National Guard and four Utah Air National Guard units, Nelson said.