Marines are putting an "extreme emphasis" on the number of pull-ups leathernecks can do, a recently published internal study found. And that, some fear, could result in other important qualities that are vital to the Corps' mission being overlooked. Participants in a study on Marine Corps culture were often focused on pull-ups as a best measure of a person's value and worth, researchers found. Marines' ability to lift their own body weight on a pull-up bar was "routinely what Marines referenced when discussing physical standards, a Marine's value, and physical readiness," the report's authors wrote. Read more on Military.com.