Simple: you can't hear it, unless you're going to be lugging around an amp. Arguably, that be the most entertaining marching band I've ever seen.I have never seen a Guitar in a marching band. There is probably a really good reason for that. :-D
There's only 2 things I can think of why the french horn is difficult compared to other brass.
[1] it has such a small mouthpiece - but I even play some cornet, etc and the FH is easier for me (granted I played FH consistently for years and years vs other brass). Now the Tuba was hard for me on the occasions that I tried it.
[2] FH has that thumb valve to switch between Bb & F horns. but then those pesky Trombones may have multiple "extension" triggers (F & G triggers) and require one to be much more accurate on the slide position.
Now marching, I think the concert FH would be the worst (excluding the marching FH). Of course, I don't want to even think about marching with an oboe.
Simple: you can't hear it, unless you're going to be lugging around an amp. Arguably, that be the most entertaining marching band I've ever seen.
I have a wireless setup, that when combined with my "big" amp could easily balance (drown out) a marching band, and has a range much larger than a football arena.
I do not like marching and have never had to march, but I might like marching a wireless guitar just for the potential mayhem.
Assumption: you were pushing the cart .