More than 60 Republican lawmakers have signed a letter to U.S. Defense Secretary Leon Panetta accusing the U.S. Air Force of being “hostile to religion,” according to Fox News.

The letter, drafted by Reps. Todd Akin (R-MO), Diane Black (R-TN) and Randy Forbes (R-VA), calls on Panetta to investigate a series of cases where the Air Force “succumbed” to pressure from outside groups, such as the removal of a paragraph from a Squadron Officer School training document saying, “if you attend chapel regularly, both officers and Airmen are likely to follow this example. If you are morally lax in your personal life, a general moral indifference within the command can be expected.”

The document was taken out following a complaint by the Military Religious Freedom Foundation that the line “creates the inescapable impression that regular church attendance is a requirement for commissioned Air Force officers in order to demonstrate positive morals to subordinates.” The foundation said it violates the constitutional ban on religious tests for U.S. office holders.