It doesn't. My unit in Korea, the 240 gunner carried the 240, and it was actually the AG who carried the M9 (we had three man teams... the ammo bearer carried an M4). But, M9s are typically issued to 240 gunners because they don't get a bayonet (they still issued them when I was in). Thus, the M9 serves as their bayonet.
I'd be inclined to think that you've either mistaken a ready position for something else, or else have fallen into a snipe hunt. The ready position is a tactical carry position - there are no steps to it, as it is not part of drill, and there's a few different ready positions, the most common being a ready carry for patrol, then you have your high and low ready positions for high alert situations.
The official sidearm of the US Military is the Beretta M9, 9mm Parabellum pistol. I would imagine that at the level of operations the Navy SEALS are at, the individual can carry the sidearm of their choice. This may well be the M9, but another popular pistol is the M1911A1, .45ACP which was the official US Military sidearm from 1911 until the 1980's (before the M9). I don't know of any restriction regarding their choices. I doubt many would carry a .22LR Derringer though :)
Alert Carry is the weapon pointed downward, the downward carry is similar if not also known as the Low Ready. It is the modern form of carry today as people would rather risk an Accidental Discharge (AD) on their foot vs. their head or someone elses. I was thought it easy to remember as "alert to the dirt". Carry vs. Ready: Carry means just that, and Ready means just that as well, when a weapon is pointed at a target it is known as (sometimes High) Ready. The opposite of Alert Carry is the Tactical Carry. The Tactical carry is the older and lesser used today by the military as it points the muzzle to the sky diagonally across your body.
The M9 is a standard 9mm round. the M9 is actually a .355 caliber
"Small Steps" is a book by Louis Sachar. It does not have songs in it, as it is a novel.
M9 paper
m9 paper
If they carry a gun at all, it is usually the M9 pistol, or a colt or S&W .38 Special revolver. ---- The .38 is rarely seen in the military any more. The primary handguns are the M9 Beretta 9 mm or the M11 SIG Sauer 9 mm (SIG P228).
The M9 is a handgun that is widely used in the world.
Currently the standard side arm of the US military is the 9mm M9 Beretta pistol. I know many officers that continued to carry their own .45 because of the lack of stopping power of the 9mm round used by the M9 pistol.
Yes it isn't exactly called the M9 it has some oter letters in it but it is still the M9.That is my favorite gun on MW3 so far.