Chief Ward (Jimmy Hunt) and Officer Kenney (Kenneth Kimmins) carry Colt Python revolvers as their sidearms. They're seen holstered in several scenes, but only taken out when the two confront David and Linda in the school.
The US Marines, particularly General G. Climet Wilson (James Karen), Sergeant Major Rinaldi (Eric Pierpoint) and Captain Curtis (Christopher Allport), use M1911A1 sidearms. They're also held by the two Martian-controlled NASA technicians in Wilson's office.
The M16 rifles used by the US Marines in the film are M16 (SP1) models with M16A1-style "birdcage" flash hiders.
Error creating thumbnail: File missingM16 aka SP1 (flat "slab side receiver") with an A1 "birdcage" flash hider, used to resemble the M16A1 during the 1970s and 1980s. This version has a 30 round magazine - 5.56x45mmError creating thumbnail: File missingA Marine MP fires his M16 at a speeding truck commandeered by two Martian-controlled NASA technicians. The "slab side" receiver indicates that this is a SP1.Error creating thumbnail: File missingMarines open fire with their M16 rifles.
Trivia: The U.S. Marine Corps supported the production with equipment and Marine Reservists acting as extras. Thus, the LAV-25s in this movie are actual LAV-25s. Along with Heartbreak Ridge, another movie which received USMC support, Invaders from Mars is one of the first films to feature the LAV-25.
The Marine Squad Leader (Dale Dye) is seen using an M47 Dragon against the Martians. This is one of the earliest appearances of the weapon in a feature film or television series.
Some of the Marines battling the Martians can be seen carrying M16 rifles fitted with M203 grenade launchers. These are the same fake M203 grenade launchers seen in various films made in the 1980s, such as Scarface, Heartbreak Ridge, Predator, etc.
