For those who like to criticise Phil Barker and WRG for their writing style, I would like to suggest they look at Force on Force. Page 20, under:
"End Phase: Move and/or Fire Remaining Non-Initiative Units." Paragraph 2.
"Only Overwatch units may react to a non-initiative unit that moves in the 'end-phase,' although units being charged by a non-initiative unit initiating Close Combat may still perform defensive fire under the rules for Close Combat."
Well, that is clear as mud then...