model rocket competition in the united states is governed by the united states model rocketry sporting code (usmrsc), also known as the "sporting code." an annual rules change process (rcp) permits nar members to propose improvements and corrections to the sporting code. any member may submit a proposal, which is posted online for a public comment period. following the comment period, the authors of the proposals have one opportunity to adjust their rcp based on member feedback. the rcp process concludes with a member vote on the proposals. those rcp's that pass get added to the sporting code in time for the next competition year.