It would require a massive cultural shift, on a number of levels.
Top 100 Defense Contractors (most privately owned) 2007: [1]
Further, histories like the one with Chertoff [2] makes U.S. politics really a dirty place: spend trillions of scared US tax payers' money on frying them with cancer in the name of fight on terror with Al Qaeda (quick hint: while we fight them here in US (and of course spend most of your tax money on it), we ally with them somewhere else at the same time [3]).
[1] http://www.govexec.com/magazine/2007/08/top-100-defense-cont...
[2] http://gawker.com/5437499/why-is-michael-chertoff-so-excited...
[3] http://www.redstate.com/streiff/2011/03/27/us-allies-with-al...
They don't just do this in the military industrial complex, they do it across the board, making decisions that benefit their portfolios and constructing their portfolios so their decisions get benefits from laws being passed.
http://www.thedailybeast.com/articles/2011/11/15/ethically-c...
http://www.professorbainbridge.com/professorbainbridgecom/20...
Yes. What kind of a question is this?
See the first link joering2 posted. If you look at the top 10 defense contractors you'll find that several of them are also Nasa contractors.