This thread is not even military related let alone aviation related!
OK. When I was a flt cdr at RAFC Cranwell IOT(military
and aviation!) the standard of English used by some who aspired to be officers in the RAF frightened me.
An officer, as a leader in a military force, needs to be able to communicate in such a manner as to be readily understood and not misunderstood. Grammar and the correct use of the language that one was brought up to speak and write is an integral part of that ability.
Other Ranks have no immediate need for such a consummate skill until they reach a position where they also need to be able to communicate - so it's OK if they talk and write in gibberish. One could have argued that some who graduated from IOT should have been in this position.
Those who argue on this thread that correct writing has no place are either of the latter category, an OR, or, horror of horrors, a civilian.