Final answer:
Nine types of authorized locking devices used within the Department of Defense are: padlocks, mechanical combination locks, electronic combination locks, biometric locks, keycard locks, keypad locks, magnetic locks, deadbolt locks, and smart locks.
Step-by-step explanation:
Within the Department of Defense, there are several types of authorized locking devices used for security purposes. Here are nine examples:
- Padlocks: These are versatile and commonly used, offering varying levels of security.
 - Mechanical Combination Locks: These locks require a specific sequence of numbers to unlock.
 - Electronic Combination Locks: These locks use a keypad or electronic input to enter a specific code.
 - Biometric Locks: These advanced locks use fingerprint, iris, or facial recognition to grant access.
 - Keycard Locks: Access is granted with a swipe or proximity to an authorized keycard.
 - Keypad Locks: Similar to keycard locks, but entry is granted with a specific code on a keypad.
 - Magnetic Locks: These locks use an electrical current to keep the door locked until released.
 - Deadbolt Locks: These locks offer high security and are typically found on exterior doors.
 - Smart Locks: These locks can be controlled remotely through a smartphone or connected device.
 
These are just a few examples of the types of authorized locking devices used within the Department of Defense.