In a memorandum dated this Jan. 15, five days before President George W. Bush left office, a top Justice Department official wrote that those opinions had not been relied on since 2003. But the official, Steven G. Bradbury, who headed the Office of Legal Counsel, said it was important to acknowledge in writing “the doubtful nature of these propositions,” and he used the memo to repudiate them formally.

Mr. Bradbury said in his memo that the earlier ones had been a product of lawyers’ confronting “novel and complex questions in a time of great danger and under extraordinary time pressure.”

The opinion authorizing the military to operate domestically was dated Oct. 23, 2001, and written by John C. Yoo, at the time a deputy assistant attorney general in the Office of Legal Counsel, and Robert J. Delahunty, a special counsel in the office. It was directed to Alberto R. Gonzales, then the White House counsel, who had asked whether Mr. Bush could use the military to combat terrorist activities inside the United States.

The use of the military envisioned in the Yoo-Delahunty reply appears to transcend by far the stationing of troops to keep watch at streets and airports, a familiar sight in the wake of the Sept. 11 attacks. The memorandum discussed the use of military forces to carry out “raids on terrorist cells” and even seize property.

“The law has recognized that force (including deadly force) may be legitimately used in self-defense,” Mr. Yoo and Mr. Delahunty wrote to Mr. Gonzales. Therefore any objections based on the Fourth Amendment’s ban on unreasonable searches are swept away, they said, since any possible privacy offense resulting from such a search is a lesser matter than any injury from deadly force.