Final answer:
Section III - Daily Inspection Before Use of DD Form 626 is the section that can be used as a guide to pre-inspect the vehicle before leaving the motor pool.
Step-by-step explanation:
The section of DD Form 626 that may be used as a guide to pre-inspect the vehicle before leaving the motor pool is Section III - Daily Inspection Before Use. In this section, soldiers must perform a thorough inspection of the vehicle, checking for any damage, leaks, or malfunctions. They should also ensure that all required equipment, such as fire extinguisher and spare tire, is present and in good condition.