My previous comment might have been a bit confusing. I think the rules can 
be summarized like this:

MILESTONE_VIEW: allows setting the milestone at the time a ticket is 
created, but a user can't change the milestone for an existing ticket 
without TICKET_CHGPROP.

TICKET_CHGPROP (or permission that grants same privileges, such as 
TICKET_MODIFY): Allows milestone for a ticket to changed, but it can only 
be changed to NULL if user doesn't have MILESTONE_VIEW (or permission that 
grants same privileges, such as MILESTONE_MODIFY).

MILESTONE_VIEW + TICKET_CHGPROP: Change milestone for an existing ticket.

Without MILESTONE_VIEW or TICKET_CHGPROP, a user can still see the 
milestone field for a ticket, and therefore see the name of the milestone 
to which a ticket is assigned.

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