DARPA has just issued a SBIR call titled "Secure Software Components Leveraging the seL4 Microkernel”, see
The SBIR program funds “small” enterprises (that’s <500 employees in US speak) that are majority US-owned. The program clearly aims at developing an ecosystem around seL4. In the past US company that won SBIR projects sub-contracted some of the work to NICTA, so there seems to be no problem in involving foreign entities as subcontractors.
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