Tracy and Julie are currently based in Orlando, FL and work with MK2MK.  MK2MK is a ministry of Cru and stands for Missionary Kid to Missionary Kid. Their mission is to build a global, spiritual community of MKs who impact their world for Christ. They care for, resource and equip missionary families by discipling their kids, helping them to thrive as they serve Christ on the mission field and in transition.
To get  better idea of the work the Dykes are doing, have a look at this.
Campus Crusade (now known as CRU) was started to reach college students for Jesus Christ.  They have expanded their focus to include adult professionals, athletes, high school and college students. Cru members are passionate about connecting people to Jesus Christ.