We are Severed Ties, AFO Wolfpack, AFO Neptune, AFO Outlaw, Ghost Recon Spec Ops and the Special Air Services' Chain Of Command, Call-sign 'Overlord'.
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The Join Operations Chain Of Command is a group of people dedicated to carrying out orders "from the top", that is, of authority. It is part of a power structure: usually seen as the most vulnerable and also the most powerful part of it. The Chain Of Command is the line of authority and responsibility along which orders are passed within a military unit and between different units. Orders are transmitted down the Chain Of Command, from a higher-ranked soldier, such as a commissioned officer, to lower-ranked personnel who either execute the order personally or transmit it down the chain as appropriate, until it is received by those expected to execute it.
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This is the Join Operations Chain Of Command Head Quarters. Orders from 'the top' will be given out here on the Battle Feed, so keep your eyes peeled for the latest Ops and Missions. When an order is given out, it will normally start off by the team's Call-sign. For e.g: "Wolfpack 1, this is Overlord. We have an op for you. You've to infiltrate sector Charlie, where you will link up with Outlaw 1 and Neptune 1. Once doing so, you will be 'weapons hot' on all tangos you come across. How copy?"

Then, Wolfpack 1 would reply: "Roger that."

This means that Wolfpack 1 would have accepted the mission/Op.
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