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I would recomend Yanks with Tanks and Brits with Battleships from TVTropes' UselfulNotes section (They also have a bunch of nations with weapons articles, all that detail the nations military set u...
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Source: https://writers.stackexchange.com/a/42492 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
I would recomend Yanks with Tanks and Brits with Battleships from TVTropes' UselfulNotes section (They also have a bunch of nations with weapons articles, all that detail the nations military set up, even if historical, like Rebs with Repeating Rifles, which is about the military of the Confederate States of America.). They are fairly good. The United States military is famous for it's inter-service rivalries (to the point that the US military refers to foreign forces as "The Adversary" to preserve a joke at the Navy's expense: An Army General was once bored in a meeting about "The Enemy (Russian military) forces" and promptly explained to the young officer giving the briefing that "The Russians are the Adversary. The Navy is the Enemy!"). If you google U.S. military jokes, expect to see most about the various services, especially ones about Backronyming names... the U.S. Military loves them acronyms and it's not hard to string a few to cover a few groups. There are even quasi-alliances (The Army and Air Force (which has it's roots in Army) tend to gang up on the Navy and Marines (Both are under Department of Navy) and vice-versa. The Coast Guard (sort of the red headed step child of the services) tends to be the bottom of the totem pole between the Navy and Marines and will be mostly ignored by the Army and Air Force, but they will support the Coast Guard if it means they can also attack the Navy and Marines. This also bleeds into some wonky insistent termonology (yes it's listed under that trope) such as those who fly planes in the air force being called Pilots, but those who fly planes in the Navy are Aviators. Each service even has an official approval grunt! Of course, one cannot discuss the United States Military Culture without discussing the U.S. Marine Corp (USMC) who have such a culture identity, there's a sub-trope about their cultural identity on TVTropes (Semper Fi). The Marines are generally the badasses of the U.S. Military and very much encourage this trope. The official song of the USMC explicitly states that God himself chose the Corp to guard Heaven. There is also no such thing as an Ex-Marine or Retired Marine. There are only Marines, some of who are Honorably Discharged at the moment... and those that were dishonorably discharged were never Marines, retroactively if necessary (No True Scotsman, this attitude also is prevalent with respect to Marines that commit serious criminal offenses.). Marines also have an ideology that "Every Marine is a Rifle Man" from the lowest private to the top General and this actually creates a unique culture to how they eat: The other four services feed Officers first, Enlisted second and from top to bottom rank in the mess. The USMC reverses this and the Enlisted eat first followed by the Officers, and lowest rank to highest in order as the job of fighting stuff is enlisted duties and that's all what the marines about (except the air force where officers do the fighting... and eat first). Given the sheer personnel size of the U.S. Military (2nd in the world), they do have a very developed culture, to the point that they even have their own unique accent (enforced, so that everyone can be understood) and are given to spelling in NATO Alphabet. They also are unique for singing in formation (Jodi Calls) which include not safe for work lyrics (in fiction they almost always start with "I don't know what I've been told..." and often have a Sound)