I’m not sure if the San Diego Marauders were an actual group or a studio creation. Cecil Calvert ran Compose Records from his home at 450 Orlando St. in El Cajon, just east of San Diego.

Compose Records released two singles by the San Diego Marauders. The first had an original by Cecil Calvert, “Don’t Come Around” backed with a good version of the Olympics “The Bounce”. Released as Compose Records 1901/2, the Monarch Δ number 56767 dates it to April or May of 1965. “Don’t Come Around” has a good garage sound, and runs a minute and a half!

The second single is interesting for including “Ervin Rucker, vocal” and featuring an original song by Rucker and Ervin Groves, who often collaborated together.
Compose Records 1903/4: “Baby Can’t You Feel It” (E. Rucker and E. Groves) / “Sentimental Reasons”.

In July 1967 and 1968, Cash Box’s list of ASCAP publishers includes “Groham c/o Cecil Calvert, 450 Orlando”. Calvert also had a June, 1964 copyright for a song called “Shackles of Love” written with Robert L. Jackson. If it ever was recorded, I don’t believe it saw release.