Kei's Sam is wearing his Cap suit simply because it's objectively better than the Falcon suit he was using before. On the plus side it also makes him stand out pretty well. He's brought his paramedic kit and will be very much re-enacting his Air Force days with locating people and treating them on the spot until they're stable enough to bring back to the base camp where other medical staff can take over.
Storm brought Stormcaster just in case (for the extra strength etc it gives her if nothing else), so she's a full on powerhouse. Possibly most importantly she can fly, and also attempt to direct breezes through to people who are stuck so they have a steady supply of air.
Laura has strength, claws that can slice through anything that's too large to move, and can use her chaos magic to stabilise and lift things as well. She speaks Russian in case there's need of translation.
Cassie as she said in her post will be in wolf form sniffing out survivors. Any time she finds someone she'll use thought-speak to alert whoever's the closest.
Aracely came with the teenagers and will basically just be floating in the main camp telepathically locating people in need of rescue. She'll try to send out calming waves as well, and can also speak Russian.