Have you ever been in a marching band? A group that performs from instruments when marching?
No, In highschool I was in band for 1 day and then kicked out. Do you play in one?
No I dont but I know they consist of brass, percussion, and woodwind instruments. Why did you get kicked out? Haha
I was a punk kid. I think I was playing the drums before we were even allowed to touch anything. I had been playing my entire life so it was no big deal to me. 
Oh okay I see! Did you get as far as uniforms? Most marching bands wear uniforms
Nope, it would have not been my style anyway. Our uniforms had big hats that looked like something out of Russia from WW2.
. (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
pep band is the same as most marching bands, using mainly woodwind, brass, and percussion instruments. Pep bands typically don't use primarily orchestral instruments (double reeds, strings, etc.), but this is not a hard set limitation.
Pep bands have been in existence for a very long time, however their origins are vague and hard to find. The concept of pep band most likely sprung from marching band (a band during sporting events with choreography while they play music, normally with uniforms).