Standard weapon of US military personnel, most notably the US Marines on the Naval Vessels.
Beretta 92FS
Standard sidearm of US military personnel.
Norinco Type 56
The Chinese AK/AKM variant, the Type 56 (and 56-1 the folding stock version) are the most commonly seen AK47/AKM rifle in movies and television (at least those done by U.S. Production companies). The Type 56 (fullstock) version is commonly seen in the movie, usually in the hands of terrorists of many different stripes. Terrorist guards from several organizations are seen wielding the weapon in Rangoon, Islamic Extremists in a mountain fortress in Tajikistan, and North Korean Soldiers.
AK-47
In addition to the many Norinco Type 56 Chinese AK rifles, terrorists are also seen wielding what looks like original milled receiver AK-47 rifles with original front sights (not the hooded Type 56 sights). However, being how 'new' they look, they can be the third pattern AK-47 "Legend Series" rifles imported by Poly Technologies, Inc, between 1988-1989. Those were high end identical clones of the original AK-47 rifles but very few were imported.
Norinco Type 56 Target
Tajikistan terrorists are seen using an long barreled AK-47 variant rifle. It has an underfolding stock and a long barrel but no bipod.
Sa vz 58
Carried by Tajikistan terrorists at the mountain fortress.
SKS Rifle
Carried by Tajikistan terrorists, they appear to be the Russian built SKS rifles with laminated stocks and full blade bayonets.
Heckler & Koch PDW (MP7 prototype)
Carried and used by Lt. Kara Wade (Jessica Biel) when she is shot down over North Korean Territory.
Colt M733
Though the official Colt 733 was 11.5" we see 10" M16 short carbines, in the hands of covert ops thugs in Alaska.
DShK Machine gun
Seen most notably at the North Korean Border outpost.
Oerlikon 20 mm cannon
At the mountain fortress, there are several gunners who are manning World War Two vintage Oerlikon 20 mm cannons.
SA-7 Launcher
SVD
Zastava M70AB2
A curious thing is that all the North Korean Troops carry the Yugo Zastava M70AB2 AK rifle (with a flashlight taped to the front hand guard).
Lt. Ben Gannon (Josh Lucas) takes a Heckler & Koch G36K fitted with AG36 grenade launcher from a Black Ops guard and uses it against them in the hangar. This is one of the earliest appearances of the grenade launcher in a film.
Steyr AUG
A Black Steyr AUG is held by a black ops guard, Gannon tell him to set it on the ground. When Gannon is ambushed, the guard picks it up again, but is shot by Gannon. Steyr AUG rifles can also be seen in the Alaska Base Armory.
Colt M4 Carbine
An M4 Carbine is used by a guard to ambush Gannon. Also M4s are seen in the Alaska Base armory against the wall and being handed out to guys sent to kill Gannon.
M60 Machine Gun
Seen on the table of the Alaska Base Armory
Leader Dynamics T2 MK5
These Australian Assault rifles are seen in the Alaska Base Armory and being handed out to guys sent to kill Gannon.
L1A1 Self Loading Rifle
In the Alaska Base Armory, we also see Australian Wood stocked L1A1 SLRs against the wall and also being handed out.
Sterling L2A3 submachine gun
A Sterling L2A3 SMG can be seen in the Alaska Base Armory.