Glocks make more sense if you're trying to fill holsters for cheaper and are limited to the amount of training you give or receive.
But I notice that a lot of more "elite" forces use Sigs - I own two Sigs and I think that they're great guns. Extremely reliable, durable, etc. But I don't really know why they would be better for military use than Glock. The Glock is as reliable, it's simpler to operate and has fewer parts.
So why Sig then? I don't know the answer, but I hope somebody can fill me in. It seems when the budget allows, they are quite in-demand pistols. But they're more expensive (more money to machine an aluminum alloy or steel frame over polymer) have more parts, etc.
Somebody fill me in.