OK, so what is "Missionary License"?
At one time a Missionary License was issued to just about anyone who worked for the denominaiton and was not issued one of the ministerial credentials. A review of listings in a recent YEARBOOK leads me to believe that this is still somewhat the practice, with some changes.
Present credentials are: 1) Ministerial Credential, 11) Honary/Emeritus Ministerial Credential, 2) Commissioned Minister Credential, 22) Honaryl/Emeritius Commissioned Minister Credentiall, 3) Commissioned Ministry of Teaching Credential, 33) Honary/Emeritus Commissioned Ministry of Teaching Credential, 4) Missionary Credential, 5) Administrative Ministries Credential.
Persons who have Licenses rather than Credentials are not commonly listed in documents such as the YEARBOOK.