If I knew my country's armed forces were 100% a domestic defense and emergency response force, I would absolutely have considered signing up when I was young. You learn good skills, and I see great value in some larger-than-self contribution to community there. My father is German and left Germany for good not long after doing his compulsory 1 year service. He hated it, and it was one of many factors that led to him emigrating. But one thing my aunts have told me is that before he joined he was a disorganized messy irresponsible person, and afterwards he was neat and structured. He is also an amazing marksman, which he learned there (before he left they were talking to him about advancing him through sniper training). He amazed my Canadian uncles when he went hunting with them.
But even here, in Canada, the armed forces gets involved in adventures abroad which I can would characterize as "dubiously thought through" at best ... but "blatantly imperialist" at worst. Being deployed to Afghanistan or some other adventure that I could not support would both enrage and depress me.