None
Colt .45 ACP
Wild guess- but if your question refers to the guard at the Tomb of the Unknown Soldiers at Arlington Cemetery- no. As the guard walks his post, stops, and conducts an about face, he changes the shoulder that the rifle is carried upon. For information regarding WHICH shoulder, and why, search for information on the Honor Guards at the Tomb of the Unknowns. Interesting information.
Colt .45 ACP
sidearm and a rifle.
CCW is shorthand for "carry concealed Weapon". It generally refers to a sidearm that is suited for concealed carry. These would be smaller and flatter than most sidearms. Nearly any sidearm CAN be carried concealed, but some are more readily caried in that fashion.
no
That generally depends on the regulations of the department that the detective works for. Some police departments require a certain model of sidearm, while others are more relaxed about the sidearm requirements.
Most of the federal agencies are using .40 cal hollow points.
security guards in Florida can carry a .38 pistol, 9mm pistol, 12gauge shotgun, and a ar-15 rifle with aproprite tranning to carry that firearm
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 :)
A typical security guard is not allowed to carry a gun. There are security guards that carry guns, but they must get additional permits and training for this. Guards without guns can do what is called a private arrest. Security guards with guns generally work for the government, military, casinos or some other money bearing entity.
No