No it's the USCG that do Search & Rescue in the USA they also Police the entire yachting fraternity. They have immense powers and can order any boat off the water for a variety of reasons. The USCG do not run a tow you home service, if you need a tow then a commercial tow is arranged, hence these guys who just recover boats and equipment for insurance companies and/or scrap value.
At the risk of being accused of putting this splendid organisation down they have more money than any other charity. I don't begrudge their wealth my only beef is their doctored life saving figures. If they do give you a tow then you go into the books as "X lives saved" X being the number of people on board regardless of the fact there was no danger of life and all they are doing is kindly offering a free towing service.
My donation included. As Byron said they have vast sums held on deposit and in the past have attracted the attention of the Charities Commission.