Have you taken offense to something? Nobody was questioning the service of your ancestor or the man in the photo. But it's pretty common knowledge that studio photos aren't always, maybe moreso than not, a great representation of what they actually wore/carried during their service. Guys would enlist then go right to the local photo shop and have their picture taken for their loved ones, long before they were issued anything. They wanted to look military and ready for a fight and studios were happy to make that happen. You see infantry guys armed with knives, pistols, and sometimes swords, even uniforms they hey never would've had in reality. To get a real idea of your ancestors experience you need to dig deeper and many knowledgeable people here are happy to help if you choose to stick around.