Which form must be annotated before releasing any keys?

The correct answer is AF Form 2432. This form is specifically designed for the documentation and control of key management and access. It ensures that all individuals who handle keys are properly identified and that there is a clear record of the keys' distribution, usage, and return. Annotating this form before releasing any keys is critical for maintaining security protocols and accountability.

The other options do not pertain to key management. AF Form 1000 is typically used for evaluating performance in the Air Force, and while DA Form 285 is associated with reporting incidents in the Army, it is not relevant to key control. SF 86 is a standard form used for background investigations and security clearances, but it does not cover key issuance.