The demand for increased export power generation and ground vehicle electrification are escalating trends due to the warfighter’s expanding mission requirements. Today’s low-voltage alternators used in some fielded ground vehicle’s power systems supply up to 650ADC, or 18kW. Future demand for vehicle export power generation is expected to reach and exceed 100kW. A majority of electric machines capable of meeting this level of power generation rely on rare-earth elements such as Neodymium (Nd), Samarium (Sm), Dysprosium (Dy) and Terbium (Tb). Due to diminished reserves in the United States, availability abroad and price volatility, continued use of rareearth permanent magnet materials may not be viable. The expanding demand for vehicle power is on a trajectory which surpasses the U.S. ability to reliably harvest or procure rare-earth magnet materials. As such, electric machine topologies that utilize zero rare-earth magnet materials are being considered for ISG (integrated-startergenerator) applications. This paper investigates alternative permanent magnet materials and motor topologies for the design of an ISG capable of 100kW of output power and a continuous/peak torque of 1200Nm/1800Nm that do not include rare-earth elements. A comparative analysis detailing the zero rare-earth permanent magnet material selection process along with accompanied motor topology will be given.