More of a whistle...

[J21Clem2]

The whistle that you would hear from the army while they march, "Do tu, Do tu.." Yeah don't laugh. Trying to find the title of the whistle march. Thanks in advance.

[Jules001]

I think what you're looking for is Colonel Bogey (it was the tune they whistled in Bridge over the River Kwai)

[lookslikemik]

There's an audio sample here, so you can confirm if it's the tune you mean: http://www.kendormusic.com/str2003/9002.htm