R - Repair.
L - Lift-Off.

Units

S - SCV
M - Marine
F - Firebat
C - Medic
G - Ghost

V - Vulture
T - Tank
G - Goliath

W - Wraith
D - Dropship
V - Science Vessel
B - Battlecruiser
Y - Valkyrie

Buildings

B - Basic Structure. Then...

C - Command Center.
S - Supply Depot.
R - Refinery.
B - Barracks.
E - Engineering Bay.
T - Missile Turret.
A - Academy.
U - Bunker.

V - Advanced Structures.

Then....

F - Factory.
S - Starport.
I - Science Facility.
A - Armory.

Add-on Buildings

C - ComSat Station (Command Center).
N - Nuclear Silo (Command Center).
C - Machine Shop (Factory).
C - Covert Ops (Science Facility).
P - Physics Labs (Science Facility).

Spells

S - Scanner Sweep (ComSat Station).
T - Stim Pack (Marines & Firebats).
A - Heal (Medics).
R - Restoration (Medics).
F - Optic Flare (Medics).
Y - Yamato (Battlecruisers).
L - Lockdown (Ghosts).
C - Cloaking (Ghosts & Wraiths).
D - Defensive Matrix (Science Vessels).
I - Irradiate (Science Vessels).
E - EMP (Science Vessels).

Specials

L - Load (Bunkers & Dropships).
U - Unload (Bunkers & Dropships).
O - Siege/Tank Mode (Tanks).
I - Use Spider Mines (Vultures).
N - Nuclear Strike (Ghosts).
N - Arm Nuclear Silo.

Engineering Bay

W - Infantry Weapons.
A - Infantry Armor.

Academy

U - U-238 Shells.
T - Stim Pack Tech.
R - Restoration.
F - Optic Flare.
D - Caduceus Reactor.

Armory

W - Vehicle Weapons.
P - Vehicle Plating.
S - Ship Weapons.
H - Ship Plating.

Control Tower(Starport)

C - Cloaking Field.
A - Apollo Reactor.

Machine Shop(Factory)

I - Ion Thrusters.
M - Spider Mines.
S - Siege Tech.
C - Charon Boosters.

Science Facility

E - Research EMP.
I - Research Irradiate
T - Research Titan Reactor

Covert Ops(Science Facility)

L - Research Lockdown
O - Ocular Implants
M - Moebius Reactor
C - Personal Cloaking

Physics Lab(Science Facility)

Y - Yamato Gun
C - Colossus Reactor