You are giving credit to NASA for things they had nothing to do with. The Navy was tasked with the fundamental tasks of GPS, the Air Force took over at the end and finalized and implemented it. It was a defense project all the way and is still currently maintaining it. Don't feel bad. I've heard NASA given credit over the years for a number of things that they only used, never created or developed. People simply assume that if it has to do with the upper atmosphere or space, NASA must have done it. NASA enjoys this quirk of society and benefit from it whenever and however they can.
As far as the OP, from time to time NASA hits the air waves to garner public interest to secure relevance and funding. To allude to "another Earth" is ridiculous, irresponsible and jeopardizes their credibility.... if the puplic ever does their own thinking.
I don't know why I would feel bad. NASA and the Air Force have always been very close. Damn near all the astronauts trace their careers back to the AF. GPS would not have been possible without NASA blazing the way into space. True that many things get accredited to NASA for which they had no part in development. Things like Teflon and Velcro come to mind. But to deny the benefits brought by NASA research is short sighted.
http://science.howstuffworks.com/innovation/nasa-inventions/nasa-high-tech-products.htm
http://science.howstuffworks.com/innovation/inventions/top-5-nasa-inventions.htm
As to the "other earth" discovery. It is a mathematical certainty that another earth like planet exists somewhere. Look up at all the stars if you can away from light pollution. Do you think those are just there for us to look at? All of those stars are Suns with planetary systems surrounding them just like ours. There are too many to count and we only see a fraction of our own Milky Way Galaxy let alone the whole universe. To deny the ability to get to any of these exoplanets is one thing but to deny the existence of such worlds is mathematically impossible.
Exhibit A.
[video=youtube_share;udAL48P5NJU]http://youtu.be/udAL48P5NJU[/video]
If you want to navigate and explore the image on your own to see that the little dots are not just background noise.
http://www.gigapan.com/gigapans/167515
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