WASHINGTON (AP) _ Less than 2 percent of the more than 147,000 Army Reserve and National Guard members ordered to active duty since last August have been excused from duty for health or hardship reasons, an Army official said Thursday.

''People have been pleasantly surprised'' at the readiness of the reservists, said Van D. Hipp, the Army's deputy assistant secretary for reserve affairs, noting that the Army callup is the largest since the Korean War.

The rate of ''nondeployable'' reservists has been about the same as for the regular active duty force, Hipp said

He said that about one-half of the reservists put on active duty have been sent to the Persian Gulf. The others serve in the United States or at U.S. bases in Europe.

Separately, the Army announced Thursday it ordered 247 National Guard and Reserve members from Florida, Illinois, New York and Wisconsin to active duty for the Persian Gulf War. Most are with transportation units. They are scheduled to report for duty Friday.

Hipp also said that more than 10,000 retired Army personnel have volunteered to return to active duty since the start of the Gulf War. He said 634 of those have been put back in uniform.

Because the available pool has not covered all skills needed by the Army, about 280 retired officers have been involuntarily put back on active duty, he said. Most of those are medical specialists.