Hi chachee99 & welcome to chordie!
I think you are referring to a well-known bugle call.
The name of the tune is "First Call" or "Call to the Post".
It is one of many bugle tunes traditionally used as signals in the military. Long before radios were invented drums, bugles, horns, gongs and other devices were used to send signals on the battlefield and within encampments.
Bugles can make only 5 different tones since they have no valves.
Perhaps the best known bugle call is "Taps" which is played at military funerals.
Unfortunately, bugling is a dying art . . .
I don't know where tabs for this bugle call might be, but here is a Wikipedia article with a sound file along with standard musical notation:
http://en.wikipedia.org/wiki/First_call
Here another article covering more bugle calls:
http://en.wikipedia.org/wiki/Bugle_call
Hope this helps, James
"That darn Pythagorean Comma thing keeps messing me up!"
[url]http://en.wikipedia.org/wiki/Pythagorean_comma[/url]