Cowboys For Heroes April 1 at MacArthur Parade Field. Round up your posse and head on out to the JBSA-Fort Sam Houston Parade Field! Step back into the Old West with cowboys and chuck wagons. Enjoy this family-friendly event that includes mechanical bull rides, trick roper, pony rides, petting zoo, family hay rides and sounds by our live DJ. This event is sponsored by the GUNN AUTOMOTIVE GROUP, First Command, Security Service Federal Credit Union and Silver Eagle. No federal endorsement of sponsors intended. If you plan to drink, please drink responsibly.