Petty Officer 1st Class Juan Lopez shows a Dominican Republic sailor the importance of the purge valve during training on the self contained breathing apparatus as part of a subject matter expert exchange in the hangar bay of the amphibious assault ship USS Kearsarge. Kearsarge is supporting the Caribbean phase of Continuing Promise 2008, an equal-partnership humanitarian/civic assistance mission involving the United States, Canada, the Netherlands, Brazil, France, Nicaragua, Colombia, Dominican Republic, Trinidad and Tobago and Guyana.