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US Sailors detained in Iran.

WASHINGTON — A devastating new report by military investigators released Thursday found that the 10 sailors captured by Iranians in January suffered from “failed leadership” at all levels on a mission that was plagued by mistakes from beginning to end.

“This incident was the result of failed leadership at multiple levels from the tactical to the operational,” investigators wrote in the detailed, partially redacted, report.

The report found the crews were poorly prepared, their boats not properly maintained, communication almost entirely lacking, and their conduct after being captured by the Iranians wasn’t up to military standards.

Read More: 10 Navy sailors detained in Iran return to San Diego

In a devastating finding, the report said the sailors went off course almost immediately after heading out to sea and had no idea where they were when a mechanical failure struck one of the boats.

“The boat crews could visually see Farsi Island, but were not concerned as they were unaware that it was Iranian or that they were in Iranian waters,” the report said.

The report details a lax culture for U.S. Navy sailors who routinely patrol the Persian Gulf which ultimately led to a highly embarrassing incident for the U.S. military just as crippling economic sanctions were set to be lifted as part of the Iranian nuclear deal.

“The culture … (was) characterized by informality. They conducted no patrol briefings, and missions were supported by no formal mission analysis, standard planning factors, risk assessment, or overwatch,” investigators wrote.

And after they were captured and held for 24 hours, more mistakes were made. The report found that some crew provided more info to their Iranian captors than they should have and that they ate while being filmed — something they should not have done because it can be used as propaganda. One crew member disobeyed a direct order, the report said.

Asked by their captors how it was possible a boat like theirs could have traveled such a distance, one sailor replied, “Yeah, I wish you could tell my people that because we told them these boats don’t do that” — a statement investigators said was inappropriate.

The report concluded, however, that the Americans didn’t violate international law, while the Iranians did.

The lax culture clashed with what investigators called a “complex transit” of 259 nautical miles from Kuwait to Bahrain that required more than the 24-hours advance notice the crews were given.

“Essentially, there was no time given for the team to think through the task before executing. The collective team felt a sense of urgency for a mission that had previously been rescheduled and had no required accomplishment date,” the report said.

The Iranian Revolutionary Guard captured the sailors January 12 after an engine died on one of their two boats. As the sailors waited for repairs, the Revolutionary Guard approached in several boats and took them captive with guns drawn.

“The engine casualty in Iran’s territorial seas is the culmination of failures in multiple areas, including maintenance, personnel qualification, sustainment training and crew rest,” they wrote.

After the sailors had breached both Iranian and Saudi Arabian territorial waters and been forced to stop, the sailors did not have a plan for communicating their location or progress with officers.

“There was no coherent plan to communicate with the craft of plot their progress in relation to the approved navigation plan,” investigators found.

The capture was elevated to stunning prominence as Iranian television broadcast footage of the sailors being held at gunpoint on the same night as President Barack Obama’s final State of the Union address. The sight of U.S. sailors with their hands behind their heads being held by Iranian military raised sharp criticism from Republicans who were already firing away at Obama for his handling of ISIS in the Middle East.

The report also found that the crew was never familiarized with the region, and didn’t know about weather, geography or potentially hostile threats.

In addition, before going out to sea, there’s supposed to be a written patrol briefing. But personnel couldn’t recall seeing that, the report said, and the investigation couldn’t find it and questioned if it had existed.

The U.S. craft were also undermanned, and couldn’t be operated at the same time the weapons were being manned.

The report said that mission leaders showed “blatant disregard for the genuine concern of sailors,” not listening to their concerns or empowering them.

Two officers have already been fired after the fiasco — Capt. Kyle S. Moses and Cmdr. Eric Rasch — and the report indicated that six more crew members of the Coastal Riverine squadron could be punished.