I get where you're coming from, and I anticipated a response like this, but also there's some realities I respectfully believe you're at risk of over-generalizing.
In the modern world armed forces are often positioned as a way out of poverty, or to a fulfilling career, because they're one of the last jobs that will actually train you. (Especially if you can't afford college.)
I have my own opinion that swearing oaths to a state that can tell you "Go kill them or else" is a bad idea, but I can only control me.
Regardless, a mixture of people join up: Many of which wanna just do their 4 years and leave. Most of which never see combat. Many of which do incredibly valuable work like weather monitoring! But also few really get a choice where they're deployed.
My point being: These are human beings killed. Those on the other sides are human beings killed. This is a net negative. For all we know, these U.S casualties were the base cooks. We don't know if they ever aimed any weapon at another living soul. We don't know who these people are.
The kneejerk reaction is to say "They had it coming" because we don't like what's happening, but that thinking will swiftly rot our humanity.
The puppetmasters that are pointing these human beings at each other for their own sick games are the ones that should be punished and destroyed. NONE of these people needed or deserved to die.
War does not determine who is right — only who is left.
–Bertrand Russell