public Builder clearRallyUnit() {
        if (rallyUnitBuilder_ == null) {
          rallyUnit_ = org.bwapi.proxy.messages.GameMessages.UnitId.getDefaultInstance();
          onChanged();
        } else {
          rallyUnitBuilder_.clear();
        }
        bitField1_ = (bitField1_ & ~0x00100000);
        return this;
      }