 Redesignated 88th Observation Squadron in 1921 the squadron moved from Langley to support Army ground forces at Fort Campbell, Kentucky; then to Texas in 1927 at Brooks Field to patrol the Mexican Border; to Oklahoma in 1928 to support Fort Sill, then back to Brooks Field in 1931.Squadron moved to California in 1935 and was assigned to the new Hamilton Field near San Francisco, as part of the 12th Observation Group.Became a coastal patrol squadron operating amphibian aircraft, then began to operate modern Martin B-10 bombers in 1936 in the reconnaissance mission when attached as the fourth squadron of the 7th Bombardment Group, 1st Wing, General Headquarters Air Force.