There must be a lot of stuff that you need which is not really limited by US law and that people could work on from their home countries. Examples just in software engineering: Cloud infrastructure, user interfaces, communication platforms, open source projects that are 90% of where you needed them to be to use them, BSP layers for embedded systems you want to use.
If only it was that simple - in a former job I designed systems for a non-US multinational that did ITAR work and it was incredibly painful to work out the rules for who could or could not see particular items of data.
>Applicants must be a United States citizen ... >We hold all information confidential and are an equal opportunity employer.
[1]Title VII of the Civil Rights Act of 1964, as amended, protects applicants and employees from discrimination in hiring, promotion, discharge, pay, fringe benefits, job training, classification, referral, and other aspects of employment, on the basis of race, color, religion, sex (including pregnancy), or national origin.
[1]http://www1.eeoc.gov/employers/upload/eeoc_self_print_poster...
"Employers should not ask whether or not a job applicant is a United States citizen before making an offer of employment... the law prohibits employers from hiring only U.S. citizens or lawful permanent residents unless required to do so by law, regulation or government contract" [1]
However, from the job listings, it sounds like that all employees would have access to regulated information, thus exempting them from the prohibition:
"...U.S. citizen, permanent resident alien or otherwise able to review all export-controlled technical information."
[1] http://www.eeoc.gov/laws/practices/inquiries_citizenship.cfm
The Chinese do silly things like blow up satellites (causing space debris), to show their might - things that the US had done 30 years ago.
Whereas, the US has systems that can track and predict all space debris of sizes greater than 1/2 inch.
It's just orders of magnitude more advanced.
http://www.defensemedianetwork.com/stories/u-s-navy-missile-...
On the other hand the argument was about China's technical abilities and intercepting something in a higher orbit with a faster closing velocity is harder to do than the US's anti-satellite test. The Chinese proved they could destroy surveillance satellites and the US didn't really show that they could do the same.