Hi Blondie.
Personally I havent seen that much missionaries that went straight to branch work or travelling. In fact having a missionary to do Bethel work would be a waist of money.
I do have seen some that came from other branches in the developped world and were assigned as bethelites, they brought some needed skills with them ( accounts, construction).
Directly into travelling work is not wise in a third world country as conditions are bad sometimes not to speak of learning the local language. All of the missionaries I have seen coming went straight into homes. That was a periode of almost 10 years I served as a missionary.
No single sister I have seen being assigned.