True. However.......
Each academy may only select 20 candidates to appoint with a ROTC nomination.
This includes JROTC and college ROTC. With JROTC you need to be in a designated "honor" unit to nominate across a branch. e.g. An honor AFJROTC unit can nominate to USMA.
If you are in college ROTC you may only receive a nomination for the academy in your ROTC branch; e.g. NROTC only nominates to USNA.
Even if you receive a ROTC nomination it is prudent for you to actively seek nominations from your MOC's and all other sources from which you qualify.