While looking for something else, I discovered a good read from 2013. It is a 39-page document (with a 2-page forward). It is freely available (with attribution) in the public domain at:

About a 75-minute read, it seems as applicable today as it was seven years ago.

For God and Country: Religious Fundamentalism in the US Military

ABSTRACT: Tension over what constitutes proper religious expression within the United States military has significantly intensified over the past decade. This paper examines and analyzes recent reports and several prominent cases, revealing how religiously motivated behavior has increased over the years and remains either tacitly or overtly endorsed by senior military leaders. In light of increasing religious fundamentalism within the ranks, coupled with a lack of social and political will to affect change, the cultural reticence to hold commanders accountable for inappropriate behavior remains an obstacle. The paper concludes with actionable recommendations.

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Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof…

Excerpt, First Amendment United States Constitution

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Go ye therefore and teach all nations. Matthew 28:19

The Holy Bible (KJV)

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Jefferson and Madison did not bequeath us a “Christian nation.” The United States has never had an established church, and our Constitution grants no special preference to Christianity. In fact, there is only one reference to religion in the Constitution proper: Article VI bans “religious tests” for federal office. The Constitution contains no mention of God.

Rev. Barry Lynn, Ex. Dir. Americans United for Separation of Church and State

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It is the job of an evangelical Christian chaplain to evangelize. It’s protected by the First Amendment’s guarantee of free exercise of religion.

Tom Minnery, Senior Vice President Focus on the Family