SAR (Search and Rescue)
One chopper from the last mission didnt make it out and it crashed. Send a platoon in to look for survivours/secure the crash site?
or
A bombercrew had to eject in your vicinity, link up with them and await extraction?
This will make it possible for a joint mission with the Airforce including Jolly green giants and Sandys (Skyraiders).
(Vietnam SAR movie)