To clear up a few inconsistencies:
A. 6 month Residence requirement was done away with revisions that went into effect Aug 28, 2008.
B. If you will be stationed in Missouri you can use your Military ID to establish residency.
From RSMo 571-101 " 2. A certificate of qualification for a concealed carry endorsement issued pursuant to subsection 7 of this section shall be issued by the sheriff or his or her designee of the county or city in which the applicant resides, if the applicant:
(1) Is at least twenty-three years of age, is a citizen of the United States and either:
(a) Has assumed residency in this state; or
(b) Is a member of the armed forces stationed in Missouri, or the spouse of such member of the military; "
C. There is no time limit on your training certificate.
D. Once training is completed and you have time to make an appointment with your local sheriff you take your ID along with a copy of your training certificate and the method of payment the sheriff expects (up to $100.00). The maximum the sheriff can take is 45 days. If they have not heard anything adverse within the 45 day period, they must issue the certificate of qualification. Some counties are taking 7 days or less, some more.
E. Once the certificate of qualification is issued by the sheriff, you have 7 days to take the certificate to the local DOR office and have the endorsement placed on your Missouri Drivers License or Non-DL. The endorsement is good for 3 years.
God Bless and may you return home safe and sound.