I beg to differ. In knew of an armor officer who was a citizen of Ireland and chaplain who was a citizen of Poland.
Not in the US military, all commissioned officers by statute must be USA citizens. Has been since, well, ever.
There was a period where duality wasn’t argued, but in 2004 or so, DOD made it the defacto policy. Forswear any and all duality or be separated. I was an ROTC cadre at the time, some wannabees walked, only to find the govt recouping tuition once they quit.