In many marches, such as the following, the last note of the melody is repeated emphatically (or repeated an octave above). Often using sforzando, marcato, or fortissimo possibile. Here are a few ...
Wikipedia states: French Horns tend to always carry the rhythmic backup of a march. For example, in cut-time marches, they are typically assigned upbeats (the + of 1 and 2) to provide the "pah" ...