Cases Computer Simulations (known as C.C.S.) was a software company which specialized in strategy and war games for the ZX Spectrum, a number of which were ported to the BBC Micro, Acorn Electron, Amstrad CPC and IBM PC.
Their cassette inlays often featured quite stylized pictures and they were renowned for producing a succession of high quality games. Many of their later releases were written by well-known wargamers R T Smith & Ken Wright and received excellent reviews in the mid and late 1980's
Source: Wikipedia, "Cases Computer Simulations," available under the CC-BY-SA License.