Streamline programs are almost always outside of VA programs. Streamlines are offered for everything from VA to ARM to conventional. If you choose to refinance through a streamline loan, you'll most likely lose your VA benefits, have to pay closing costs, and your have to qualify in the same way you did for the primary mortgage. So if you had a cosigner, they'd need to cosign again, if you had a secondary on the deed or note, they'd have to remain secondary - etc. Make sure you read all the fine print, and make sure that you will not lose any of your VA benefits if you do streamline.
Streamline loan programs are also not backed by the Fed, unless the loan is being offered through a federal entity - and I've never heard of that happening. Although with the link above - there could be some new VA assistance program I've never seen before.
Honestly from a real estate standpoint - VA loans are basically the best lending situation you can get into. They save you money, you don't have to worry about closing costs or your lien holder suddenly collapsing - and the best part is that they're fully transferable - which is a huge plus if you sell in the future and decide to do a buyer assumption for your loan. So again, if you do streamline make sure it's not going to take you out of your VA loan, and put you into something else.