badgeexpert field medical badge 68ws may be awarded the combat medical badge (cmb) and expert field medical badge (efmb), if they meet qualification requirements. the cmb is awarded to medical personnel assigned or attached to, or under operational control of any ground combat arms or combat aviation units of brigade or smaller size, who satisfactorily perform medical duties while the unit is engaged in active ground combat, provided they are personally present and under fire. in contrast, the efmb is awarded following successful completion of an intensive two week-long validation of field medical skills. only one badge may be worn on their uniform at a time, although 68ws are allowed to earn both.