^^^I like to learn something every day: why were (or are) there numbers of Lithuanians serving in the US military?
A large number of Lithuanians came to the US as refugees from the Nazi's and Soviets. They lived here, had kids, raised families, etc, while retaining a strong Lithuanian identity and community. Their kids, and grandkids, having been born here were US citizens, and my understanding from the guys I talked to, was that that Lithuanian community put a lot of emphasis on being martial and joining the US military to be ready to fight the Soviets and reclaim their homeland. When the USSR fell in the 90's, and the Lithuanian government reformed they welcomed home, and gave citizenship to, pretty much any ethnically Lithuanian kids of refugees (and obviously the refugees themselves, if still alive). Due to the aforementioned strong community identity, a lot of Lithuanians in the US took them up on the citizenship. Either dual US/Lithuanian, or just straight going home. The way it was explained to me on my first Defender Europe was that in 1992-93 the fledgling government of Lithuania stood up an officer corps of pretty much all ethnically Lithuanian, US trained folks who had returned from the west. That let them neatly sidestep the whole "We need a military, but those guys were Red Army last week" trust issues many former SSRs had.
Since then, and even more since 2004, they have been very proactive in cross training at US bases and doing a lot of joint exercises with us and the rest of NATO. They joined ISAF early on, and when I was working with them in 2019 had managed to actually meet the NATO "2% of GDP" military funding requirement.