You are the on-call personnel for an infrastructure service with many dependent systems. Upon receiving an alert that the service is failing to fulfill most requests, affecting all dependent systems and their hundreds of thousands of users, you assume the role of Incident Commander (IC) in accordance with your Site Reliability Engineering (SRE) incident management protocol. Additionally, you have enlisted two seasoned team members as Operations Lead (OL) and Communications Lead (CL). What is the next step you should take?