ITS AN INERT TRAINING DEVICE
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You are absolutely DEAD WRONG- the yellow band denotes HE, the training AT4 tube has a blue band. I know from EXPERIENCE, Blue in Ordnance denotes “ Training”, Yellow HE ( loaded with energetic material).
Where do people like you come from? You will get someone killed if handling Ordnance.
Speaking of DEAD WRONG, Read the manual.
Color-Coding. M136 AT4 launchers are marked with color-coded bands (Figure 3-5). A black with yellow band indicates an HE antiarmor round (early models had a solid black band). A gold or yellow band indicates a field handling trainer; no band indicates an M287 9-mm tracer bullet trainer
https://www.globalsecurity.org/military/library/policy/army/fm/23-25/FM232_4.htm