FBI says scandal affected 34 officers . Examination done by officers that included proficiency exam answers . Those officers served at Malmstrom Air Force Base in Montana . Defense Secretary Chuck Cheney said to be disturbed by scandal at nuclear facility .
Pentagon says scandal involves 34 officers . Cheating done by text that shared proficiency exam answers . Those implicated served at Malmstrom Air Force Base in Montana . Defense Secretary Chuck Hagel said to be disturbed by scandal at nuclear base .