The Roswells' service began in 1966 on Bonaire with Chuck operating and maintaining transmitters, safety and first aid, EMI coordination, frequency coordination and a shortwave listeners program. Barb served in finance, listener mail and hospitality. In 1993, they were assigned to TWR Europe: Monaco and Austria with Chuck working in propagation, frequency selection and monitoring.
They retired in December 2002 and relocated in January 2003 to Source of Light Ministries International (SLM), Madison, Ga. Chuck works in photography, audio visual aids and emergency management. Barb works in hospitality and as a receptionist. TWR refers listeners to SLM's Bible correspondence courses.