Yes. The applicable counterpart on the paper SF-86 (which reflects current requirements for how such questions are to be answered) states:
"Disclose all financial obligations, including those for which you are a cosigner or a guarantor [...]"
Remember, just having debt isn't a bad thing; consider that most older folks have home and/or vehicle loans (or even educational loans for their own children).
It's having delinquent debt (90 or 180 days delinquent or any amount of delinquency on Federal debt (regardless of whether it has been sent to collections), or having liens placed against you), or appearing to have too many obligations compared to what you earn, that is a bad thing...
When answering security questionnaires, always provide all information as asked for unless it is specifically and explicitly excluded.