American multiple visa is like tylenol extra strength, you can use it until it expires for any reason.

Drug : american tourist visa

apperance: sticker like sticked to a page in a non american passport.

usage: permit to get to port to entry for US.

Dosage: once every 6 months until the expiration date .(for the expiration date see the visa)

reason. Mostly used for son/daugther's graduation or new family addition. tourism and many others. pls consult ur lawyer if this visa is right for you. 

Basically....the visa can be used for the validity of the visa for a valid reason