Imagine your spouse got promoted to a Chief (senior enlisted rank) in the military. Prepare a minimum of 250 word letter as to why your spouse were selected as a Chief Petty Officer. 
Reference:  https://en.wikipedia.org/wiki/Chief_petty_officer_(United_States)
This would be a female spouse writing a letter. Her husband is promoted to Chief.
Important points to touch in the letter: Dedication, work ethic, hard work, family man etcetera.
250 work minimum but no more than 300. Please do not make the letter very formal. Keep it informal. Thank you.
No formatting or APA requirements. Plain text is fine. Thank you.