It appears unlikely to me that the proffered encrypted text, if it is written according to the rules of English, is a substitution cipher.

Why:

-In English, the only letter that exists as a word on it's own is 'a', yet in this piece of encrypted text, the letters E, S, L and W (in order of appearance) are on their own. In a substitution cipher, the original letter is represented as the same encrypted letter throughout. It is not possible for the letters E, S, L and W to equal 'a'.

-In the encrypted text, there are three consecutive one letter words that come out in an encrypted form as 'S L W'. Having three consecutive one letter words is not possible in a short, military style of language. Repeating one letter words is usually used in something like,
"a.....a........a.........achoooo", in creative literature. From what I can gain from the context description, this is a military style message from a game.


If this is not a substitution cipher, what kind of encryption is it, how does it work, and how do we go about analysing it?