What is the maximum length allowed for fingernails?

The maximum length allowed for fingernails is indeed 1/4 inch past the fingertip. This standard is in place to maintain a professional and uniform appearance among military personnel. Longer nails can hinder effective and safe operation of equipment, and they may also pose hygiene concerns. Maintaining nails at this length ensures that they are neat and do not compromise personal or operational safety. Option D, stating that none are allowed, is not correct; while excessively long nails may be discouraged or considered unprofessional, a specific allowance exists. The other length options exceed the established standards, making them inappropriate as well.