Valuable contributions all 'round. In the Western rite, historically, subdeacons were not allowed to marry.
The statement was made that in the West, traditionally, subdeacons were considered a major order. This is not true at all. The Council of Trent said so, but it is scarcely traditional, but was a modernist subversion of the West's genuine patrimony.
In the traditional Roman rite, the deacon, rather than the subdeacon, brings the gifts to the priest at the altar as the offertory begins. But I could be overlooking some older regional tradition of which I am simply ignorant.
Otherwise, no qualms about the informative posts above. Thank you all.