I answer a lot of questions on military issues so I thought It'd be fun to put together a few primers on it covering different aspects. Since this is pretty narrow -- based on my experience in US forces, there is a lot more to cover than I have, so feel free to throw in comments with your own thoughts, or even put together a specific primer of your own, that'd be cool too. Thanks to sbrooks103x, as always for editing these otherwise-unreadable tracts.
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How to Pew. Volume 1.
Some More or Less Random Thoughts on Writing Military Fiction
Military fiction can be, if you'll pardon the pun, a bit of a minefield. Even if you've served in the military, your experience is very different from pretty much every other man or woman who has served. Country, time period, branch of service, type of unit, military specialty and sheer luck will make everyone's perceptions different, so there is no easy one-size-fits-all set of rules, but there are some helpful things to keep in mind.
Note: This one is about the basics, so there's no real primer on tactics, etc. It's also mostly on the Modern era -- WWI to Present or so.
Everything is Different
Every service is different, every time is different: Army to USMC to Navy to Coast Guard to Air Force, every service has its own standard behavior and its own set of rules, both written and unwritten. The rules vary by time and place. An Army unit full of draftees in the Vietnam War in 1969 is incredibly different from the same unit full of volunteers in Iraq in 2008. Unless you were there, you'll have to look things up to get it right.
Every job is different: There are a lot of different jobs. Not everybody is primarily a shooter -- there are finance guys, medical, administrative, etc. Most of them have basic combat skills, but we're not talking Delta Force if you have a graphic designer. That said, even a National Guard "Weekend Warrior" who works as a grocery store manager may well have three tours kicking in doors in Iraq, and is likely far more dangerous in a gunfight than the average gang-banger. Don't sell Reserves or Guard short, some of those units perform exceptionally well.
Joining up
Every service has some version of "basic" or "boot" training. The intent of it is to do some physical conditioning, but mostly to get you started integrating into military culture. Learn to be part of a team, recognize rank insignia, learn some traditions, and start to think in military terms. Basic skills, like map reading, taking care of your feet on marches and which end of the weapon the bullets come out of are taught here. This is usually 8 to 14 weeks, depending on service, time period, etc., and it usually isn't a lot of fun at all. This is followed by courses on whatever specific job you are going to perform is -- anything from infantry to cook to supply clerk to chaplain's aide.
The schooling will never quite stop, by the way. If you stay in, you get rank and skill specific schools of various kinds.
The Army
I did my twenty years in the Army, enlisted. Mostly in rather non-traditional units, but I worked with many of the active divisions. That said, my experience will not exactly match anyone else in the Army.
Frankly, I'm also a little concerned for the Army. Every place I ever went, some First Sergeant or Sergeant Major told me, "Well, that's the way we do it here, but that's not how it's done in the real Army." As far as I can tell, I never managed to actually find the real Army. I always assumed it was somewhere at Fort Hood, Fort Bragg or Fort Benning, but in every one of those places, I was told the exact same thing.
So where the hell is the real Army? We seem to have lost it, and that's really bad, because the Army is expensive and like everything else that's expensive,
somebody is signed for that shit.
We'll probably all get called back and have to go look for it. Hopefully it's just stashed in a warehouse somewhere and not being sold on eBay.
The Air Force
I worked with both flying units and non-flying units. I can't begin to describe the difference, it's almost like two completely different organizations. While the ground units are very professional, often in a sort of "corporate" manner, for lack of a better term, the flying units are extremely motivated, extremely focused and very combat oriented.
The Navy
I did a couple floats with the Navy and worked with a couple of their flying units. Like the Air Force, there are different "Navies" that seem to be completely different organizations -- Shore, Fleet, and Brown Shoe (Aviation). Each has its own personality and quirks. The Navy also has weird rituals. The ceremony for crossing the equator to convert Pollywogs to Shellbacks is across several Navies and merchant ships; to us non-sailors, it is just strange as hell.
The USMC
The Marine Corps is smaller than the other services, and get much of their support from the Department of the Navy, so they have a higher combat troop to support troop ratio. The standard of training is very high and they are generally outstanding. They are, however, far more parochial than the other services and do not always work and play well with them, and that is occasionally problematic.
The Coast Guard
These guys work for Homeland Security these days, with the ability to be placed under the Navy if necessary. They do all kinds of things, but be aware they are actually credentialed federal law enforcement.
Special Operations