Hi @PatrickIU  Survey123 is where the validation is done in the Damage Assessment workflow.  In Survey123, you can use a PULLDATA function to automatically calculate this and persist the value in the field - pulldata("@geopoint",${location},"USNG").  There are more details in this post - https://community.esri.com/t5/arcgis-survey123-blog/working-with-usng-and-mgrs-in-survey123-for-arcgis/ba-p/891510 
						
					
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