24       24-hour Endurance Snowmobile
A1       Aviation Advertising
A2       Aerial Application
A3       Aviation Aerobatics
A4       Air Ambulance
A5       Air Taxi
A7       Auto Stunt Driving
A8       Abalone Diving
A9       Aerobatic Skydiving
AA       Auto Drag Racing
AB       Aviation Ferrying
AC       Aviation Firefighting
AD       Auto Hill Climbing
AE       Aviation Inspection
AF       Aviation Instructional
AH       Aviation Prospecting
AI       Auto Road Rally
B1       Business Aviation
B2       Base Jumping
B3       Boxing
B4       Bungee Jumping
B5       Banner Towing
B6       Bush Flying
C1       Championship Auto Racing
C2       Certificated Route Air Carrier
C3       Chartered Air Carrier
C4       Commercial Aviation
C5       Construction Helicopter
C6       Corporate Aviation
C7       Crew Member Aviation
C8       Cross-country Aviation
C9       Cross-country Motorcycle Racing
CA       Cave Diving
CB       Cross-country Snowmobile Racing
CC       Cartography
CD       Cliff Soaring
D1       Demolition Derby
D2       Demonstration Aviation
DR       Driving
E1       Endurance Racing Inboard
E2       Experimental Skydiving
F1       Flying
F2       Figure 8 Demolition
F3       Formula or Grand Prix Auto Racing
F4       Forestry Aviation
F5       Fire Fighting
G1       Glider or Sailplane
G2       Grand Prix Motorcycle Racing
G3       Ground Skimming
H1       Hot-air Ballooning
H2       Hang Gliding
H3       Hydroplane Racing Unlimited
H4       Hydroplane Racing Inboard
I1       International Racing (Auto)
I2       Intermediate Junior Snowmobile Racing
I3       Ice Diving
I4       Iceboat Racing
I5       Inboard Racing
I6       Ice Climbing
J1       Jet Car Racing
J2       Judo
K1       Kart Racing
K2       Karate
M1       Midget Racing
M2       Military Flying
M3       Modified Outboard Racing
M4       Motorboat Racing
M5       Modified Stock Motorcycle Racing
M6       Motocross Racing
M7       Mountain Climbing
M8       Military Skydiving
M9       Modified Stock Snowmobile Racing
MA       Modified Snowmobile Racing
MB       Motorcycle Acrobatics
MC       Motorcycle Dirt Track Racing
MD       Motorcycle Drag Racing
ME       Motorcycle Enduro Racing
MF       Motorcycle Hill Climbing
MG       Motorcycle Ice Racing
MH       Motorcycle Observed Trials
MI       Motorcycle Road Racing
MJ       Motorcycle Road Riding
MK       Motorcycle Speed Record Trials
ML       Motorcycle Speedway
N1       Non-scheduled Flying
O1       Off Road Auto Racing
O2       Offshore Racing
O3       Outboard Performance Craft Racing
O4       Oval Sprint Snowmobile Racing
O5       Other
O6       Open Modified Snowmobile Racing
P1       Passenger Aviation
P2       Personal Aviation
P3       Photographic Aviation
P4       Pilot Aviation
P5       Pleasure Aviation
P6       Precision Flying
P7       Private Flying
P8       Parachuting
P9       Professional Outboard Racing
PA       Parakiting
PB       Parasailing
PC       Paraskiing
R1       Rock Climbing
R2       Rodeo
R3       Ridge Soaring
S1       Sports Car Racing
S2       Sprint Car Racing
S3       Stock Car Racing
S4       Snowmobile Enduro Racing
S5       Scheduled Flying
S6       Sight Seeing Aviation
S7       Student Flying
S8       Stock Outboard Racing
S9       Snowmobile Drag Racing
SA       Stock Snowmobile Racing
SB       Spear Fishing
SC       Scuba Diving
SD       Skydiving
SE       Skydiving Accuracy
SF       Skydiving Free-fall
SG       Stunt Flying
T1       Testing Aviation
T2       Traffic Watch Aviation
U1       Underwater Diving
U2       Underwater Hard-hat Diving
U3       Underwater Scuba Diving
U4       Underwater Skin Diving
W1       Water Skiing
W2       Wrestling
W3       Wreck or Salvage Diving
W4       World Snowmobile Speed Record