While this type of training is usually available in your local community,
here are some web resources for you to explore...
Initial EMS/Rescue Training
Wilderness Medicine Institute's courses in Wilderness EMT & First Responder,
offered throughout the year
Wilderness Medical Associates, Courses in Wilderness First Responder, EMT, and ALS
Dive Training
National Association of Underwater Instructors (NAUI)
Professional Association of Diving Professionals (PADI)
Global underwater Explorers (GUE)
Divers Alert Network (DAN)
Search & Rescue (SAR) Training
NASAR Site
Swift Water Rescue Training
Rescue 3 International
Rescue Training, Inc.