The law created was called the Defence of Realm act developed by the goverment.
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through letters written home
With my own son in the Army, I have learned a lot about what soldiers want in a letter from home. I've written a detailed list of important details to put in your letters. Please read the article in the link below.
Usually the officers rank is abbreviated such as LT for lieutenant. As for naval officers in general I have seen it written USNO but it would have to be used in specific content to make sense to someone.
By the use of morse code and written telegrams
A primary source about trench warfare during World War I could be a soldier's diary or memoir, where they recount their personal experiences and observations from the front lines. Photographs taken by soldiers or military personnel in the trenches also serve as primary sources, providing visual documentation of the conditions and daily life in the trenches. Additionally, official military reports or letters written home can offer firsthand insights into the realities of trench warfare.