The FAQ has been updated:
Q: Can you Lend-lease Militia? Colonial Infantry?
A: Militia: Yes.
A: Colonial Infantry: No
Looks like I was correct about Colonial Infantry, but Caesar-Seriona was right about Militia.
Is a major power able to lend lease Facilities such as Fortifications, air bases, coastal artillery, factories, shipyards, sea plane bases, etc…?
No. Page 32, 7.4 Lend-Lease, “A player may lend-lease: …One military unit.”
Note the list of “Units” starting Page 49, 12.2 Units.
Note the list of “Facilities” starting Page 53, 12.3 Facilities.