Security spawn next to bridge is glitched. After Insurghents capture Bravo the Security forces spawn next to the bridge, between bridge and Charlie, but are stuck in the sand. They don't respond to enemy nearby and when killed with shots on the body or grenades they just keep respawning. When shot in the head some are freed and start engaging enemy emmediately and after a few of these the spawn stops.

Captured it here:
https://www.twitch.tv/videos/636268457