Getting the .gov and .mil TLDs into the HSTS preload list would be amazing. I helped get ~20 .gov second-level domains into the HSTS preload list in February, and mentioned getting .gov into the preload list at the end:
https://18f.gsa.gov/2015/02/09...
The .gov TLD is a challenge, though, as it is used by state and local governments and other public services, like libraries, utility companies, etc. There are over 5,300 in total, and only ~1,350 of them are federal government.
https://18f.gsa.gov/2014/12/18...