FOR the return of the US Navy to the Bay of Palma and for the unchanging readiness of members of the crew of USS Enterprise to contribute their skills to local good causes. In the past helicopters have lifted heavy loads to almost inaccessible refuges but on this occasion the help was needed in practical tasks at the Fray Junipero Serra Museum at Petra. There is no more appropriate connection imaginable than that between the young American sailors of today and the birth place of the founder of California.