LDR activities (co-curricular activities) are AFJROTC-sponsored teams and/or committees which are subdivided into 3 Tiers.
Tier I (STEM Based): Any LDR that has a Science, Technology, Engineering, Mathematics (STEM) or academia-related base AND has an outside partnership that includes a national-level competition opportunity.
Tier II (Activity Based): Any LDR that may or may not have a STEM or academia-related base but does have an outside partnership and/or local level or above competition opportunity.
Tier III (Unit Based): Any LDR that is local level only and primarily benefits the cadet corps, school and/or local community.