Surveys find that men in U.S. special operations forces do not believe women can meet the physical and mental demands of their commando jobs, and they fear the Pentagon will lower standards to integrate women into their elite units, according to interviews and documents obtained by The Associated Press.

Studies that surveyed personnel found “major misconceptions” within special operations about whether women should be brought into the male-only jobs. They also revealed concerns that department leaders would “capitulate to political pressure, allowing erosion of training standards,” according to one document.

Some of those concerns were not limited to men, researchers found, but also were found among women in special operations jobs.