Standard weapon of US military personnel, most notably the US Marines on the Naval Vessels.
Beretta M9
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.
Long Barreled AK Variant
Tajikistan terrorists are seen using an unusual hybrid type of AK-47 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 MP7
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.
DHSk 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.