Defense applications with 270VDC input must meet stringent EMI, environmental, and power related standards such as MIL-STD-461, MIL-STD-810, and MIL-STD-704. The design process is further complicated by SWaP-C requirements. This white paper details the challenges faced in defense applications with 270VDC inputs that must meet stringent EMI, environmental, and power related standards while meeting demanding SWaP-C requirements.