Now, we come to uniforms - it seems every SF universe has its own uniformed military. Here are a few.

Early 2150's

Late 2150's

2250's

2260's

2270's

2280's

2350's

Early 2360's

Late 2360's

Early 2370's

Late 2370's

2380's

2390's

2520's

2800's

3000's

Aliens USCMC

Andromeda High Guard

Andromeda High Guard

Babylon 5 Earthforce

Babylon 5 Army of Light

Babylon 5 Psicop

Battlestar Galactica Classic

Battlestar Galactica Reimagined

Buck Rogers Earth Directorate

Dan Dare Interplanet Space Fleet

Dan Dare Interplanet Space Fleet

The Warrior's Apprentice Dendari Fleet

The Warrior's Apprentice Vor Officer

Farscape Peacekeeper

Firefly Browncoat

Lensmen Galactic Patrol

GalaxyQuest NSEA Officer

Honor Harrington RMN Captain

Mork & Mindy Orkan Operative

Red Dwarf JMC Technician

Space: Above and Beyond Marine Pilot

Rocky Jones Space Range Space Ranger

Captain Scarlet Spectrum Officer

seaQuest United Earth Oceans Officer

Space: 1999 1st Season Alpha Officer

Space: 1999 2nd Season Alpha Officer

Space Patrol Space Patrol Officer

Stargate SG1 SGC Officer

Stargate Atlantis SGC Officer

Star Wars Imperial Officer

Star Wars Rebel Pilot

Star Wars Rebel Officer

Thunderbirds International Rescue Pilot

Starship Troopers Mobile Infantry

UFO Moonbase Officer

Forbidden Planet United Planets

Ensign Flandry Imperial Naval Flight Corps

V: the Miniseries Visitor

X-Men First Class X-Man

X-Men X-Man

Commando Cody Sky Marshall

Flash Gordon Mongo uniform

Hammer's Slammers Mercenary

THX-1138 Chrome Robot Police

Voyage to the Bottom of the Sea NIMR Officer

Mad Max Main Force Patrol Officer

Sky Captain Royal Navy Flying Corps Officer