SOS Beacon

The SOS Beacon is a Stratagem that deploys a beacon that calls other Helldivers in orbit to your aid. 
This will create a ping on the planet map making your icon more noticeable for potential reinforcements. Deploying SOS Beacon places your lobby in a high priority position, however, it does not guarantee that others will join your team. Deployed SOS Beacon will allow player to join you even if your lobby is private. 
It is limited to one use and can kill enemies or destroy buildings when it is deployed