I guess there hasn't been a post here in 6 years, so no one is likely to read this, but I have seen lyrics to American Patrol before. They were on a reel of music on a player piano in my Aunt's cottage up in God's Country.

They started something like this:

The crowds are cheering, hear the welcome greeting,
as the boys come marching down the street.
They're back from the fray, they've won the day,
their victory is complete.
All that cheering as the boys are nearing,
fills their hearts with patriotic pride.
When put to the test they did they're best,
their praise cannot be denied....

If anyone is still interested, I can probably rememeber another verse or two. The lyrics I remember seem like WWI era, so they can't be original.

-Jeff
Downers Grove, IL