Im familiar with acw union shell jackets, and the different colored piping that each different discipline used, but were shell jackets worn in battle? Were soldiers issued sack coats, frock coats, shell jackets and great coats? And lastly,, are there any photos of artillery crews wearing shell jackets? I know "action shots" weren't a thing, but it seems like all the gun crew photos I see, they are either wearing sack or frock coats, but I haven't seen a gun crew wearing shell jackets. Photos must exist, and I'd to see them