Passing Truck

I read on the side of a passing truck
filled to bursting with soldiers:
"Armed Forces of El Salvador."

If it's true it's force
why the need to be armed?

Or is it that its only strength
is that of being armed?
Or is it that the term "armed"
is the adjectivization of the verb to arm or to assemble
currently in use
when we refer to Westinghouse refrigerators
RCA televisions
and so many other appliances
that North Americans
assemble in their local
cheap labor installations?