I don't think 6,000 NGs are enough unless you increase BP's and allow groups like the Minutemen to guard the border. Whoever is guarding the border has to mean business and I do feel all of them should be armed.
I forgot to add that state and local law enforcement can also play a role as long as their jurisdictions are not neglected in the process.
I'm not clear how "militarization" is being defined by the Pres. or anyone else. Does anyone know?