I am currently in a marching band as a hobby.
I used to perform in marching band competitions.
Oh really? What instrument did you play?
I played brass instruments, but mainly the trumpet.
I play the flute.
. (https://marching.musicforall.org/directorinfo/)
A: up to 600 students
AA: 601-1250 students
AAA: 1251-1750 students
AAAA: 1751-2250 students
AAAAA: 2250 + students
History.
Percussion and wind instruments were used on the battlefield since ancient times.
An Iron Age example would be the carnyx.
The development of the military band from such predecessors was a gradual development of the medieval and early modern period. 
A prototype of the Ottoman military band may be mentioned in the
therefore, harder to play accurately. The F mellophone has tubing half the length of a French horn, which gives it an overtone series more similar to a trumpet and most other brass instruments.
In summary, the mellophone is an instrument designed specifically to bring the approximate sound of a horn in a package which is conducive to playing while marching. Outside a marching setting, the traditional French horn is ubiquitous and the mellophone is rarely used, though they can be used to play French horn parts in a concert band or