The M16 Assault Rifle or the M4 carbine is the typical primary weapon The M9 pistol is the standard sidearm hey dont forget about the standard issue knife
According to the Department of the Treasury, Secret Service officers do not carry knives as a standard-issue weapon. Please See Link
The M4 is the basic weapon system for the modern infantry soldier. It is usually equipped with a M68 red dot sight. A standard combat load for a soldier carrying an M4 is 400 rounds of ammunition. Are you serious? 400 rounds is not the STANDARD combat load. The M16A4 is the standard basic weapon but is being replaced by the M4. A red dot is definitely not the standard sight.
The M16 rifle.
The "Short Sword" was the standard Roman Infantrymen's weapon.
brown bess
Glock 22 .40 calibre
Springfield
There are a lot of weapons which are standard issue. Assuming you're referring to the service rifle, it's the L85A2.
The standard issue was the M 14 till 1965 and the M 16 was then issued .
If you are referring to the U.S.A. Armies standard weapon for infantry it is/was the range of M16 Assault rifles. Now they are being phased out and replaced with M4 Carbines.
"Every Marine a Rifleman"The M16A4 assault rifleOther small arms include the:M9 pistolM249 SAW