WASHINGTON — Administrative punishments but no criminal charges have been leveled against U.S. military personnel for mistakes that resulted in 42 people dying in last year’s attack on a civilian hospital in Afghanistan operated by the medical charity Doctors Without Borders, officials said.

The Pentagon was expected to release the full report on the investigation today, including details about what exactly led a U.S. Air Force special operations AC-130 gunship to bomb the hospital and how those mistakes were made.

A two-star general was among about 16 American military personnel disciplined because of the attack, a senior U.S. official said. A number of those punished are U.S. special operations forces.

No one was sent to court-martial, officials said. However, in many cases a nonjudicial punishment, such as a letter of reprimand or suspension, can effectively end a military career. The officials were not authorized to discuss the case and requested anonymity.

The U.S. airstrike in Kunduz last October was carried out by one of the most lethal aircraft in the U.S. arsenal.

The Associated Press reported in March that more than a dozen U.S. military personnel had been disciplined in connection with the bombing, and that the punishments were all largely administrative.

The crew of the AC-130, which is armed with side-firing cannons and guns, had been dispatched to hit a Taliban command center in a building 450 yards from the hospital, the U.S. military said in November. Hampered by problems with their targeting sensors, the crew relied on a physical description that led them to begin firing at the hospital.