The term "Pin-Up Girls" derives from a trend that was clearly perceived in the 1940s and 1950s in the United States. It concerns posters hung by men from various social classes (most often by blue collar workers or soldiers, but not only!) With specifically dressed and make-up women with a clear erotic tinge. Let us add that although these posters were erotic, they were not treated as pornography, which was forbidden in the US at that time. These "Poster Women", that is the Pin-Up Girls, were always smiling, they wore either flared, loose polka dot or striped dresses, or very skimpy underwear, or bathing suits. They were often depicted wearing high waisted shorts. Of course, the Pin-Up Girls outfits were presented in such a way as to reveal as much of the models' bodies as possible. Let us add that also many official photos of Marilyn Monroe are kept in this style. The makeup used was also very clear with red lipstick underlined on the lips and strong black lines above the upper eyelids. It is worth adding that from the beginning of the 21st century there has been a noticeable renewed fashion for styling and makeup in the spirit of Pin-Up Girls.United States Armed Forces ) are currently the most powerful and strongest troops in the world, with an active staff of approximately 1.36 million people and a budget of $ 686 billion in 2018. One of their most important components is the ground army, i.e. the United States Army, in which 476,000 soldiers in the line served in 2017. The most numerous type of army in the ground forces is, of course, infantry - primarily motorized and mechanized. It is theoretically assigned to divisions, but in practice it very often operates within the Brigade Combat Team. Infantry units are divided into the classic Infantry Brigade Combat Team, consisting of, inter alia, three infantry battalions and support units. In 2014, it consisted of about 4,400 people and an infantry brigade on Stryker vehicles (Stryker Brigade Combat Team) based on three motorized infantry battalions and support units. In 2014, it had around 4,500 soldiers and 307 Styker vehicles in various versions. The American infantry also serves in Armored Brigade Combat Team, in companies and mechanized infantry battalions. The main shooting weapons of the American infantryman are the 5.56 mm M16 and M4 rifles. As an interesting fact, it can be said that the private (Private E1) US Army earns about $ 20,200 annually, while the sergeant (Sergeant E5) with 2 years of experience - about $ 28,700. These are basic salaries - without any allowances or bonuses.