The Rescue Operation Security Contract was added in GTA Online as part of the Contract update.

In this mission, you need to rescue the client and safely extract them. Buy some armor and snacks for this mission as you will get into a gunfight when trying to rescue the client.

Exit the agency using your agency helicopter SuperVolito. The helicopter will help you escort the client easily and safely.

Get to the marked area to find the client. You can use the blood trails to get to the client when you get to the location. Or, you can also just listen and follow the sound of gunshots.

Eliminate all the hitmen and approach the client to collect them.

Escort the client to the helicopter. On your way back, you will get chased by some attack helicopters. But ignore them and continue to the safehouse. They won't be able to catch up to you.