Migrate class not registering properly
Be sure:


your migrate_rcmd_migrate_api function is in the file migrate_rcmd.migrate.inc.
your Classes are included in .inc files defined in your modules .info file. See this documentation page on Migrate: https://drupal.org/node/1006982
Lastly in Migrate > 2.5 (i think thats the right version) migration auto discovery is now gone. You can use drush migrate-register to register your migrations and classes. See drush help migrate-register as needed.
when in doubt clear your caches: drush cc all to be sure the .inc files are registered in drupals code registry.