Section 5.

No compensation shall be paid under this act to any veteran who, during the period of service refused on conscientious, political or other grounds to subject himself to full military discipline and unqualified service, or to any veteran for any periods of time spent under penal confinement during the period of active duty, or for service in the merchant marine: Provided, however, that for the purposes of this act, active service in the chaplain corps, or medical corps shall be deemed unqualified service under full military discipline.