As an adviser to the Baghdad Operations Command, which is led by an Iraqi general, Abud Qanbar, Colonel Reese drew examples from Baghdad Province, which is less volatile than the area near Mosul in northern Iraq, where the Sunni insurgency is strongest. But he noted that he had read military reports from other regions and that he believed that there were similar dynamics nationwide.

Colonel Reese, who could not be reached for comment, submitted his paper to General Odierno’s command, but copies have circulated among active-duty and retired military officers and been posted on at least one military-oriented Web site.

Colonel Reese’s memo lists a number of problems that have emerged since the withdrawal of American combat troops from Baghdad, completed June 30. They include, he wrote, a “sudden coolness” to American advisers and the “forcible takeover” of a checkpoint in the Green Zone. Iraqi units, he added, are much less willing to conduct joint operations with their American counterparts “to go after targets the U.S. considers high value.”

The Iraqi Ground Forces Command, Colonel Reese wrote, has imposed “unilateral restrictions” on American military operations that “violate the most basic aspects” of the security agreement that governs American and Iraqi military relations.

“The Iraqi legal system in the Rusafa side of Baghdad has demonstrated a recent willingness to release individuals originally detained by the U.S. for attacks on the U.S.,” he added.

A spokeswoman for General Odierno, Lt. Col. Josslyn Aberle, said of the memo: “The e-mail reflects one person’s personal view at the time we were first implementing the Security Agreement post-30 June. Since that time many of the initial issues have been resolved and our partnerships with Iraqi Security Forces and G.O.I. partners now are even stronger than before 30 June.” G.O.I. is the abbreviation for the government of Iraq; the Iraqi Security Forces are sometimes referred to as the I.S.F.

Colonel Reese appears to have anonymously circulated a less detailed version of his memo on a blog called “The Enchanter’s Corner.” The author, listed on the site as “Tim the Enchanter,” is described as an active-duty Army officer serving as an adviser in Iraq who is “passionate about political issues.” That post on Iraq, along with one criticizing President Obama’s health care proposals, has been removed but can be found in cached versions.