Seems most of the assassinations are set up by the CIA and NSA, and then they indeed just call the SEALs or Delta Force to do the deed.
I'm thinking the American James Bond would be a high end bourbon man - perhaps Jefferson's Select or Parker's Heritage, neat. The Corvette would be the proper car, but it'd be something modified like a Lingenfelter twin-turbo custom job.
Marines for the service? Of course! SEALs and Green Berets are overused in the movies and TV. Having a Marine version of special ops - we call it Force Recon - would be a nice change.