In the sense that any task done in the military is contributing to a military goal, sure. I'll remind the Goodwill employee that they're contributing to military goals the next time I'm shopping there. (Whether you're aware of it or not, Goodwill runs a lot of the logistics operations for at least RTC Great Lakes.) By that same logic, however, pretty much everyone in capitalist societies are also contributing to the "subjugation of non-white people." There are measures that can be taken to reduce one's problematic footprints, though. I just find that most people prefer to cast stones at others instead.

Firefighters are compelled to protect the private property of the capitalist class. I'm failing to see how the military is somehow directly responsible for the person I was originally responding to living under a capitalist system whereas they are not. Mind you, non-capitalist communities have firefighting and even militaries. Neither occupation is inherently capitalistic.

Regarding the healthcare industry in the US, it's a profit-seeking venture. Anyone who participates in it voluntarily (e.g., doing software engineering for healthcare companies) is directly involved in one of America's most backwards sectors of the economy. It's a system where people are financially ruined when they're the most vulnerable or even denied treatment for the purpose of enriching the healthcare sector's capitalist class.

Why would I have to attack the meat producers first? Few meat producers are producing meat for the sake of producing meat. They produce meat because there's a demand for it. It's simple really: no one wants meat, no one produces meat. If you mean to say that most people lack the moral fiber to make ethical decisions when there's an unethical choice they enjoy, then I agree. We collectively suck when it comes to being responsible individuals. Likewise with products produced using child labor and such. In some instances, all someone can afford is unethically produced products. Most people don't even bother to put in the effort, though. Sacrifices are hard, and no one wants to make them. It's an unfortunate reality.