Short Answer 
To challenge a classification, first initiate an informal challenge by discussing your concerns with the relevant authority and providing supporting evidence. If unresolved, proceed with a formal challenge by submitting a written appeal to the responsible department, ensuring you detail your case and avoid direct email to the Original Classification Authority (OCA).
Step 1: Initiate an Informal Challenge
If you believe that information has been wrongly classified, your first action should be to initiate an informal challenge. This involves directly contacting the relevant authority or supervisor in your organization. Engage in a discussion to express your concerns, providing evidence and arguments to support your case for reclassification.
Step 2: Conduct a Formal Challenge
If your informal challenge does not result in a satisfactory response, the next step is to conduct a formal challenge. This involves preparing a written appeal or complaint directed at the department or agency responsible for reviewing classifications. Be sure to detail your case, include supporting evidence, and clearly articulate why you believe the classification should be reconsidered.
Step 3: Avoid Direct Email to OCA
It is important to note that you should refrain from directly emailing the Original Classification Authority (OCA) as your initial step. The OCA is primarily responsible for making classification decisions, and a challenge via email may not be the appropriate way to address your concerns. Instead, use the formal challenge process to ensure your challenge is properly considered.