A fiber-MOPA includes a seed-pulse source followed by fiber amplifier stages. The power train includes two composite planetary gear sets and seven engagement elements: two clutches and five brakes. Further, such a determination may be performed in connection with a mobile device service that provides free or subsidized service to mobile device users. While the stiffened peg is capable of insertion into the body, it is designed to soften in fluid such as the body fluids with which the peg comes into contact after insertion into the wound or abscess.