The Belgians have had gays in their military for years as have most Western European countries. The last thing one should care about is how Western European militaries view the US military. Their donut dolly militaries are in no position to judge.
They have that luxury because we are still the primary defenders of Europe.
The Belgians never stopped a single nation from overrunning its borders, and barely is holding itself together now.
Any military they have might as well be for traffic control for invaders passing through.