The real reason why they opted for search and rescue as the focus of the exercises (if that is what they are doing), is most likely to be because it is simple, and hard to screw-up, and so reducing the chance of any of the nations involved embarrassing themselves
Maybe this is just a starter excersise. Nothing complicated so all sides can achieve some sort of accomplishment. I wish them well.
As an USN sailor for 20 years I use to love these type of excersises. It is intresting to see how different navies can work together.
Usally during one of these excersise's what ever CV I was on was required to re-fuel one of the other nations ships. Usally a frigate or DD. Man when we went along side it seems the whole crew of what ever ship we were refueling was on deck taking pictures of our CV and waving etc. Some even held placards with messages on them. It was always a delight to see. One thing I like was the different paint used on the ships. Seems navies use different shades of grey and that grey-green color like the PLAN..I hope one day a USN CVN will refuel a PLAN ship.....Well I can dream can't I??