Cloverfield is a 2008 science fiction "monster" film directed by Matt Reeves (Dawn of the Planet of the Apes) and written by Drew Goddard (the director of The Cabin in the Woods). The film's producer J.J. Abrams assisted in making the production more of a 'stealth' motion picture, that relied more on the mystery of the project and hype to create buzz and interest rather than a traditional marketing campaign. The 2008 film mounted one of the most successful 'mystery' campaigns for a motion picture in recent history (save for the Blair Witch phenomenon of 1999). So intent were the filmmakers on maintaining the 'secret' of the movie, that its working title changed many times, sometimes to 'wacky and unlikely' titles (including the title of just its intended release date: "01-18-08"). Two films tied into the "Cloverfield" universe were subsequently released: 2016's 10 Cloverfield Lane and 2018's The Cloverfield Paradox, a Netflix original film. Tagruato and its subsidiaries share elements with the original film, and J.J. Abrams has stated he intends to produce another film to tie these elements together.
Per the "Making of Cloverfield" documentary seen on the DVD, only a few of the filming days were done in the film's actual setting, New York City. The vast majority of the film was done in Southern California, as many Los Angeles streets, abandoned factories and studio backlots were enlisted to impersonate the Big Apple. Most notably, any scenes with armored vehicles and live firing guns were filmed in California and NOT New York (as weapons laws prove to be much more restrictive in that city). Such weapons restrictions pretty much guaranteed that any film based in New York will actually film on location there as little as possible if weapons are important to the story.
The following weapons were used in the film Cloverfield:
(NOTE: Because of this movie's first-person POV filming technique, most of the weapons appearing in the film are not seen clearly or in detail, as in other motion pictures. Behind-the-scenes footage from the DVD is used for some of the guns.)
M16A2 assault rifles are used by the US Army in the first engagement with "Clover" that is taped by Hud, and throughout the film. These rifles could be M16A2 uppers on A1 lowers. However many seem to be firing 3 round bursts in rapid succession, so they could be M16A2s. Some of the M16A2s in this movie are ISS's flashbulb "non guns", and can be discerned by their oversized flash hiders in the first battle.
In the military medical station (in the department store) a clearer shot of the M16A2 rifles can be seen.
M4A1 carbines are also used by the US Army in the first engagement with the monster that is taped by Hud. Some are seen with iron sights. Also used by the US Army in the news segment that is being aired in the electronics store, the M4A1s being used by some of the personnel have the detachable carry handle mounted on the top of the receiver with ACOG sights on top and SureFire M500-series handguards.
As can be seen above, many of the M4A1s seen in the film have the carry handles attached to the flat top receivers and scopes mounted on the top.
Apparently, some of the soldiers in the film use the M249 Squad Automatic Weapon (SAW). I did not see these guns, but behind-the-scenes footage from the DVD special features confirms the apparent use of this weapon by the actors playing the troops. I will look closely at the film again to see if this weapon is visible.
FGM-148 Javelin anti-tank missile launchers are used by the US Army in the first engagement with the monster that is taped by Hud.
Browning M2 machine gun
.50-caliber Browning M2 heavy machine guns are seen mounted on the U.S. Army Humvees. They are also seen mounted on the "M109" self-propelled guns and "M1 Abrams" tanks in the movie (the former being British FV433 Abbots standing in for the M109, and the latter being visually modified British Chieftain tanks - both rented from Army Trucks, Inc.)
M136 AT4 84mm rockets are used by the US Army in the first engagement with the monster that is taped by Hud.