U.S. Field Artillery is a patriotic military march of the U.S. Army written in 1917 by John Philip Sousa. The refrain is the "Caissons Go Rolling Along" and is often sung by the band members when it is first played. Part A is not repeated and the refrain is only played twice, following style IABBCDC.
Today, the song is the official song of the U.S. Army and is called "The Army Goes Rolling Along."
The original article can be found at U.S. Field Artillery and the edit history here.