Structure of the Portuguese Army in France

[Alan Baker]

I am posting this on the off-chance that a member will have information which could clarify my query around the structure of the Portuguese army in France and make sense of the abbreviations.

I am attaching a copy of a cover addressed to Manual Costa, 6th BMM (amended to 2nd BMM). I cannot work out what the BMM might stand for.

I am also attaching a copy of the first page of a service record, which I think is his, which also shows the 6th BMM. However, it gives his unit as 1st battalion, 18th regiment. Wiki gives a breakdown of the units making up each brigade, but only quotes battalions, not regiments. There is no 18th battalion listed.

Does anyone have any ideas about this or sources of information which might clarify this?

[Alan Baker]

Second scan