Robert E. DeCoster, 79, of Onset passed away Friday May 17, at Charlton Memorial Hospital in Fall River.  Robert was the son of the late Lafayette N. and Annie (Porter) DeCoster. The committal service is Wednesday May 22, at 10:45 am at the Massachusetts National Cemetery (1 Bennington Blvd.) Bourne.  Relatives and friends are cordially invited to attend and asked to please gather at the cemetery at 10:15.  Visiting hours have been omitted.  Arrangements by Wareham Village Funeral Home 5 Center Street Wareham.