Here is the original announcement of the digitizing project with NCAP. This press release is from 2015 and announces a five year project, so they may not have completed it yet. I have not seen any more current press releases.
Update .... Ooops forgot the link:
https://www.archives.gov/press/press...6/nr16-05.html
A couple of sentences from the announcement.
"Once digitized, the public will be able to access these materials free of charge from National Archives research facilities nationwide. The National Archives will receive a copy of the digital images and metadata for inclusion in its online catalog."
The way it is worded may mean that you only get "free" viewing access if you go to one of the research facilities.