Please check in here to let your friends and family you're safe when you get the chance. And if you know if someone is out there fighting, try to check in for them here and let us know where they might be so we can have our ambulances circle around there periodically.
If you are acting as an ambulance, let us know here so we know who to depend on. If you're working in triage, let us know. And if you require assistance, say so. And as Ianto pointed out, this isn't just for medical assistance. If you need a fighter to your location, say so.