Final answer:
SIPRNET removable hard drives can be stored in a fireproof, keyed file cabinet for added security and protection.
Step-by-step explanation:
SIPRNET removable hard drives may be stored in a fireproof, keyed file cabinet. This statement is true. SIPRNET (Secret Internet Protocol Router Network) is a secure network used by the U.S. Department of Defense for classified information. Removable hard drives used in the SIPRNET system may contain sensitive and classified data, so it is important to store them securely. Storing them in a fireproof file cabinet with a key provides an extra layer of protection against unauthorized access and potential fire damage.