Starfire was built into what is commonly called an antizipper configuration.  That just means that the top of the booster section has a parachute attachment point and that the parachute itself is deployed from the aft end of the body tube instead of the forward end of the booster section. This arrangement helps avoid "zippering" the body tube with the recovery harness if the parachute is ever deployed while the rocket is traveling at relatively high speed.  Such as when deployment is well before or well after the rocket reaches apogee. 

If the parachute is deployed out the front of a body tube while the rocket is traveling at high speed, then the recovery harness will end up pulling on the lip at the front edge of the body tube to slow it down.  At very high speeds, that will result in the recovery harness tearing a slot right into the body tube and down a short length until the body tube has come to a stop.  This tear is what is referred to as "zipper" damage.  An antizipper configuration generally eliminates this failure mode.  However, sometimes, even with an antizipper configuration the end of the body tube can still get damaged.  This can happen on high speed deployments where the body tube tumbles before the shock cord comes tight.  An antizipper band was added to Starfire in order to help prevent even minor damage from that kind of scenario.

The first step for adding the antizipper band is to cut a recessed area into the lip of the body tube to allow the band to be added and still be flush with the outside surface of the tube.  This step is not required, but it hides the band and makes the rocket look better and be more streamlined.