Ground:
Firearms: the Terran imperium uses only five types of ammo to simplify supply issues on the far side of the Stargate as sometimes gates can be opened for limited amounts of time. For example the Atlantis mission had a limited gate window for passage. Same with the Icarus incident. P.S. we still haven't figured out what happened to that base.
Rifles:
Sniper rifles:
limited to 7.62 NATO
Assault rifles:
Limited to 5.56 NATO and 7.62 NATO
Machine guns:
.50 cal M2 machinegun and 7.62 NATO M60 E-series
Pistols:
Limited to .45 cal ammo
Submachine guns:
10 mm/ .45 cal optional MP-7; P-90; FN 2000
Armor:
Standard Powered armor: All suits are equipped with a standard dual Alterran/Goa'uld personal shield. And Sodan phase-shifting units. First iteration of armor was Anubis's Kull trooper armor. Uses an Asgard power core for any and all power needs
Gatecrasher armor: The standard for special ops troopers. Equipped with dual shoulder-mounted plasma repeaters. Also has a massive ammo reserve for whatever weapon the user decides to carry. Primary use is for gate exploration and guarded gate assault and fortress penetration
Stealth armor: same as GC armor W/O ammo reserve. All stealth suits are equipped with ECM systems and multiply redundant cloaking systems. Also equipped with phase-shifter backups derived from Merlin's device. Used in conjunction with Gatecrasher units
Trooper armor: has medium sized ammo reserve and jump jets
Strike armor: same as trooper armor. Used for same role as marine machine gunners and designated marksmen. Fire support.
Command armor: standard strike armor with a limited AI unit for command purposes. Used by squad leaders and above.
Tanks:
Combat drones: drone similar to Goa'uld scout drone with better shields, more plasma repeaters and power for a micro drone swarm; powered by a single MKII naqahdah generator
Gate tank: tank capable of trans-gate activity(e.g. is small enough to fit through the gate.) power: single MKIII naqahdah generator, fitted with a shield capable of taking 10-15 full power staff canon shots before overloading; weapons: single railgun as main gun, 15 combat drones, swarm of micro drones
Medium tank: power: double MKIII naqahdah generator, fitted with a shield capable of taking 20-30 full power staff canon shots before overloading; weapons: double railgun as main gun, 20 combat drones, 2 swarms of micro drones
Aircraft:
Regular(AB) fighter f-302: mongoose: same as navy fighter with extra bomb racks, and 25 mm auto cannon
Gunship: equipped with a shield, inertial dampeners, and a reactionless drive similar to that of an Al'kesh. Armed with pulsed Asgard plasma beams and 25mm rotary cannon for fire support. Capable of going through Stargate, used as assault shuttle for orbital drops
Orbital drop unit (ODU): used to insert strike units from orbit if beaming, or regular assault shuttle drops are impossible or overly hazardous
Unit structure: all units from fire teams on up are arrayed in a triad. So the unit table of organization is as follows: 3 to a fire team- 3 teams to a squad- 3 squads to a platoon- 3 platoons with HQ squad to a company- 3 companies with HQ squad to a battalion. The largest units fielded so far have been battalions. Future need for larger units has been noted but put aside for the time being as irrelevant. Each triad has an engineer whose suit has an Asgard EMC (energy to matter converter) devoted to use as an engineering resource, in addition to normal load out. A medic who has an EMC devoted primarily to use as a medical dispersal unit, in addition to normal load out. The last member of the triad is the armorer whose EMC is devoted primarily to producing ammo to refilling the armor ammo resources, in addition to normal load out. All are cross trained to do each other's job in a pinch.
The only exception to the triad structure is the units based out of the SGC. Of those the most notable are the gate units, the units assigned to new world recon missions. They operate in a most unusual structure of command. The basic unit is a pair, a gatecrasher suit with a stealth suit. The basic trans gate operational unit is an Exploration Team, or ETeam, with four sets of pairs with a combat element that is in command that stays back at the gate to secure it and also act as a rapid strike force in case of dire need. The command element has three suits, and a pair of combat drones. The suits include: the commander, who wears whatever type of suit he wants and a pair of GC suits that act as both guards for the commander, and in the roles outlined earlier. The drones act as both rear guard and personal shotgun for the commander. The number of drones can, and does, change at will. There are 11 suits in an SGC Exploration Team and a number of drones that do not number less than two at any time. There are only six ETeams at the SGC and on duty at a time with another six on a stand down rotation, and another six on ready status. The standard rotation is a week at each readiness level, starting with downtime on earth. There are also diplomatic teams that handle most of the later contacts with planets visited by an ETeam; as well as teams that are used for everything from archeology to mining to setting up new offworld Sites.