Hi. I think a good start is NAPSG Foundation
Their SAR and First Responder GeoSpatial Toolkit may be what you are looking for: https://napsg.maps.arcgis.com/apps/MapSeries/index.html?appid=71f7501c36d34dfdaf8a81b424806033
Paul Doherty is behind much of this work.
Thank you Ismael!
Yes the NAPSG Foundation SAR Working Groups have templates (ArcGIS Online and Desktop) for both missing person search (WiSAR) and disaster response (USAR). We are currently standing up our new hub site SARGIS , please take a look around there and then feel free to email us at firstname.lastname@example.org email@example.com