Engines - Because antiskid was a concern Mr Boffin raised some years ago.
SD89 - In the course of a discussion over life-cycle costs a while back, the Marines disputed a CAPE (Pentagon budgeteer) assessment that was based on AV-8B ops (where nearly all operations are STOVL) and argued that only 10 per cent (IIRC) of F-35B ops would be in STOVL mode. See this post:
http://www.pprune.org/military-aviat...ml#post8008227