Final answer:
The classification label 'Confidential' is used for information that could cause some damage to national security if disclosed but is not usually harmful.
Step-by-step explanation:
The U.S. government and military classification label that refers to information that is not usually harmful to national security if disclosed but is still not generally available to the public is Confidential. This level of classification is used for information that, if unauthorized disclosure occurs, could cause some damage to national security. In contrast, Top Secret is reserved for information that could cause exceptionally grave damage to national security if it were disclosed, and Secret for information that could cause serious damage. Meanwhile, Unclassified is not an actual classification level but rather indicates information that is not sensitive and is open to the public without any need for special handling.