Try contacting the local Sheriff's office or the Office of Emergency Management. Either should be able to tell you who the teams in your area are and give you a conatct point.

It varies across the country. In my area, techincally the Sheriff's office is in charge. They typically send an officer for representation. That person stays in the command post and works with others to direct the search efforts. There are several ground and dog teams in our area. The teams get called by the Agency of Jurisdiction which could be local town, city or county law enforcement.

County Emergency Management frequenty responds and helps out in command. The local fire department typically is also called for ground search regardless of their search training.

Civil Air Patrol is involved in search in some areas and may be another avenue to get involved.