Not a smart plan, by any stretch.
In order to be allowed to do what you apparently seek to do (frequent trips into the US, volunteering for a federal agency), you need an immigrant visa.
Marrying and planning to stay are not allowed. You need to be petitioned for either a K-1 or a CR-1.
Would be a damn shame to deplane after that 16+ hour trip, only to be returned to sender due to suspected immigrant intent/abuse of ESTA privileges at the border.