Short answer is you can't, to begin with there's no such thing as "the merchant marines" the phrase you're looking for is merchant marine, no s, secondly the term merchant marine refers to an industry, not a military service or government agency.
Saying you want to "enlist in the merchant marine" is the same as saying you want to enlist in the supermarkets, or the airline industry.
That being said, if you wish to be employed as a merchant mariner, there are a few routes you can take, one would be to attend one of the academies, or you could attend one of the trade schools, or you could get the necessary documentation and either apply dirrectly to a non-union shipping company, or join one of the maritime unions (most shipboard jobs are union and the jobs are to be had through the various union hiring halls.
you can only join the Royal marines if you have full British, Irish or Commonwealth citizenship. If you have got one of those you can join the RMC if you don't you can join the equally fine body of man that is the USMC.
yes (possible) During WW2 Audey Murphy was turned down by the Marines (I think) but accepted by the Army. Murphy was the most decorated service man during WW2
The Judge ordered the young man to enlist in the army as part of his sentence for the crime of burglary.
marines corp
He was shepherd and then merchant
Merchant exporter means that a man who buy the materials from the manufacturers and export directly from the manufacturers premises.
a football player who quit to enlist in the army{good hard working man}
Consider contacting the VFW.
yes man of cource
She was the wife of a Florentine merchant.
yes
They would kill them or torture them.