The service was held at Provider Chapel at Fort Carson, just outside Colorado Springs.
Police say Dunlap and his wife were shot and killed on Monday of last week when they surprised a burglar in their home.
A 17-year-old has been arrested on suspicion of murder and a 19-year-old on suspicion of being an accessory to murder.
Neighbors say the couple had just moved to Colorado Springs in October.
(KUSA-TV © 2013 Multimedia Holdings Corporation)