Sites within the United States •
DC-xx Semi-Automatic Ground Environment (SAGE) Direction Center/Combat Center. •
F-xx Alaskan air defense sites. •
H-0x Hawaiian air defense sites. •
L-xx Original
Air Defense Command (ADC) 1946 "Lashup" Radar Network of temporary sites to provide detection at designated important locations using radar sets left over from
World War II. •
LP-xx "Lashup" site which was incorporated into the first ADC permanent radar network in 1949. •
P-xx Original 75 permanent stations established in 1949. •
RP-xx Sites that replaced a permanent 1949 station. •
M-xx 1952 Phase I Mobile Radar station. •
SM-xx 1955 Phase II Mobile Radar Station. •
TM-xx 1959 Phase III Mobile station. •
TT-x Texas Towers, radar tower rigs off the East Coast of the United States, named because of their resemblance to oil drilling rigs in the Gulf of Mexico. •
Z-xx NORAD designation for sites after 31 July 1963. P, M, SM, and TM stations active after that date retained their numbers, but were designated "Z-xx".
Sites outside the United States •
C-xx ADC and
Royal Canadian Air Force (RCAF) manned sites on the Canadian
Pinetree Line. •
G-xx Sites in
Greenland established by
Northeast Air Command (NEAC) reassigned to ADC in 1957. became
N Sites, then
C Sites, retaining their numbers. •
H-xx Air defense sites in
Iceland. •
J-xx Sites in Japan. (includes main bases) •
K-xx Sites in
Korea. (includes main bases) •
N-xx Pinetree Line sites in
Newfoundland. Became
C Sites, retaining their numbers. Reassigned from NEAC to ADC in 1957. •
R-xx At least two sites in the Southern Pacific. •
W-xx sites in Spain. •
Y-xx sites in
Morocco. ==Aircraft control and warning squadrons==