I must not have ever heard the third verse which suggests that heaven will be guarded by Marines. The verse goes like this:
Here's health to you and to our Corps
Which we are proud to serve;
In many a strife we've fought for life
And have never lost our nerve.
If the Army and the Navy
Ever look on Heaven's scenes,
They will find the streets are guarded
By United States Marines.
What an interesting spin on Christianity and our military might. Not only are we the "protectors" of the world, but we are also the protectors of heaven. Not to sure what we are to make of this, but my hunch is that this worldview does not fit within the traditional Judeo-Christian worldview.