WASHINGTON (AP) — A former Navy SEAL's insider account of the raid that killed Osama bin Laden contains classified information, the Pentagon said Tuesday, and the admiral who heads the Naval Special Warfare Command said details in the book may provide enemies with dangerous insight into secretive U.S. operations.

Rear Adm. Sean Pybus told his force Tuesday that "hawking details about a mission" and selling other information about SEAL training and operations puts the force and their families at risk.

"For an elite force that should be humble and disciplined for life, we are certainly not appearing to be so," Pybus wrote in a letter to the roughly 8,000 troops under his command. "We owe our chain of command much better than this."