The Corps continued with its primary focus on community presence throughout its existence. The Imperials never really tried to recruit members from other areas, although some did join. Eventually, Corps membership declined in the 1970s. The Corps lost its state and national competitive presence, moving to competition in the new DCI Division II.
While the Corps became smaller, it did not lose its community and family focus. The Corps always was proud of its record and focus on stimulating musical interest, military conduct, good and proper living and sportsmanship in the youth of its community. American Legion sponsorship had changed in 1969 from the Billy Caldwell Post to the Skokie American Legion Post, so the Corps was often called the "Skokie Imperials" in the 1970s.
During the 1970s, the Corps often fielded just 45 to 50 members, but remained very musical and competitive for its size. In 1978, membership rose back to 100 for a brief period.
Typical of the music played during the 1970s: Victory for All, Summertime and Alexander's Ragtime Band (1970-71); American Overture, Blues in the Night and Birth of the Blues (1972); New World Symphony, McArthur Park and John Brown's Body (1973).
1972 - 16th at American Legion Nationals, Chicago, score 72.35; 29th at DCI Nationals, Whitewater, WI, score 59.15
1973 - 8th at VFW Nationals, New Orleans, score 69.15
1974 - 11th at VFW Nationals, Chicago, score 52.40
1979 - 5th at American Legion Nationals, Houston, score 54.00; 6th at VFW Nationals, New Orleans, score 51.30