1943 - 1945
St. Matthew - St. Paul - Umnak -
LMS Cape Sarichef
- LMS St. George
Attu (Theodore Point) -
1944 - Cape Sarichef replaced by St George as the monitor because of poor signal reception from St Matthew.
1946 - 1948
1946 - St Paul - St Matthew baseline disestablished. LMS St George disestablished. LMS Cape Sarichef re-established.
1949 - 1950
1949 - Adak replaced Amchitka. Attu, Theodore Point moved to Attu, Murder Point.
1950 - St Paul - Unimak baseline disestablished. LMS Adak disestablished, LMS Cape Sarichef disestablished.
Adak-Attu baseline moved to the Western Aleutian Chain.