I don't think so, TG. A movie poster cannot be equated with an emblem of an armed service. One represents a business enterprise, and is proprietary because it is a product which the movie company purchased to be used to promote the movie, ie it's product. That is a property which is owned or protected by copyright.
An emblem of an armed service belongs to no one person but to all the people of that country. It is proprietary in the sense that another service or country or business cannot adopt it or use it without express permission of the government, but it does not have specific ownership or copyright privilege over it.
Creating a Dream which is not for sale but which is for personal use is no different from me or Betsy Ross sewing an American flag, or drawing a picture of a soldier in uniform, or putting the Globe and Anchor as a desktop wallpaper.
As long as it is not being used to besmirch the service, nor being sold for private profit, there is nothing illegal being done.
Definition - Noun
1 : something that is used, produced, or marketed under exclusive legal right of the inventor or maker
: a drug (as a patent medicine) that is protected by secrecy, patent, or copyright against free competition as to name, product, composition, or process of manufacture
2 : a business secretly owned by and run as a cover for an intelligence operation
Definition - adj
1 a : held as property of a private owner
b : of, relating to, or characteristic of a proprietor <~ rights>
2 : used, made, or marketed by one having the exclusive legal right <a ~ process>
3 : privately owned and managed and run as a profit-making organization <a ~ insurer> <a ~ clinic>
4 : of or relating to the acts of a municipality which profit or benefit the municipality and for which it is answerable in negligence
Based on Merriam-Webster's Dictionary of Law ©2001.
Published under license with Merriam-Webster, Incorporated.