Well, I can say that there are also Wiccans, Satanists, Buddhists, Christians, and extremists of all mentioned religions within the military. There are also followers of the Shinto and various other religions that I don't know the name of within the military. In general, every religion has followers within a military, but if you just mean the U.S.Military I doubt there are many Satanists or Buddhists although there may be some. I do know that there are Pagans, Wiccans, and especially Christians within the U.S.Military.
I think it's none of my business what anyone else's religion is. As long as the soldier is able to do his or her job without being impeded by his or her religion, and provided that the soldier does not use his or her religion as an excuse to be a bigot, I don't really care what religions our soldiers belong to.
I agree with Ning and so does the military. They even have a rule stating that you can bring one religious symbol with you when you join(although this is not recommended for boot camp since most branches will require that everything you bring with you be removed and thrown away). You can bring a cross, a pentagram, whatever fits your religion, although the Navy has a tradition of taking a Saint Christopher's medallion with them. At least I think that's it, it may have been a different Saint. I'd have to ask my Pop.
Saint Michael's medallion is what all military and law enforcement agents bring with them.
Michael (September 29) --
The name of this Archangel means "who is like unto God?"
In the Old Covenant he is made known to us as the "great prince," the protector of the children of Israel (Dan. 12, 1).
Through the New Testament the Church continues this patronage of Michael (Apoc. 12, 7) and has always venerated him as the guardian angel of the kingdom of Christ on earth, as the heavenly leader in the fight against all enemies of God.
For this reason he was the special patron of Christian soldiers fighting against enemy armies.
I tried to say a lot more details here. But, THEY, will not let it post. They edited it prior to the post and placed what they wanted you to read here.
This is much bigger than I am, this thing they just did to my post.
Saint Michael is one of the saints for Military personnel, but there was another one for Sailors in particular. It was the Saint's medallion that many Sailors took with them many years ago when they believed doing so would help repel rats, disease, storms, etc.