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I suppose you have no access to the code of the package "executive_usarsim". (in that case it would be really strightforward)
If you have no access then you could remap the output of a specific topic to your desired topic (/cmd_vel) in your launch file. Here is an example which coudl be helpful to you. Your keyword shuld be "remap". Since the documentatin in ROS is not so good I suggest to look in existing codes in the Q&A. Regards