What does active duty millitary mean?

My husband is national guard one weekend a month, does this count under active duty millitary?

Business & farm

No. "Active Duty" service is different than "Reserve Component" service such as in the National Guards and Reserves.  However if your husband should be deployed for active duty service, then he would become "active duty."

There are certain tax aspects, such as travel more than 100 miles to weekend/summer training, that are available to members of the reserve components.  See IRS Publication 3, "Armed Forces' Tax Guide" which includes tax information for members of both Active and Reserve Components regarding federal income tax.
    See:  https://www.irs.gov/pub/irs-pdf/p3.pdf

View solution in original post

Business & farm

"Active Duty" and "Reserve Component" are indeed different.  However, there are certain aspects of Reserve duty which are not deployments, but are considered active duty service for purposes of pay, benefits, and taxation.  The most obvious is the (typically) 2-week annual training period.  Your state may allow deduction of this pay from your Federal Adjusted Gross Income.  For example see page 11 of <a rel="nofollow" target="_blank" href="https://dor.mo.gov/forms/Military%20Reference%20Guide.pdf">https://dor.mo.gov/forms/Military%20Refer...>.