A semiconductor integrated circuit device includes a first chip, a second chip to transmit and receive data to and from the first chip, and a through circuit provided in the first chip to transfer a clock signal and a test signal to the second chip. In a preferred embodiment, the rocket motor also includes a pressure equalizing system that accommodates changing temperature conditions during storage as well as varying gas pressure inherent in gun-launched systems in a manner that allows for thinner case cylinder design and increased propellant volume. The detector has an array of radiation sensors arranged in rows and columns and is configured to output contents of each radiation sensor in the array of radiation sensors.