I can almost say it’s not, no plane rather it’s US military including the USCG, private, commercial, another pilots fly over water all the time for many different reasons, non need a second aircraft, same with helicopters. Someone can like always correct me if I am wrong.
I had a feeling I heard this when watching tv
If you watch the first few minutes he mentions that the c-130 is there to provide comms support and SAR for the h-60 in the event of a ditching.
When other aircraft fly over the water there is someone to come rescue them but if the rescuer then crashes how rescues them. It’s like having a RIT/FAST team in the fire service