**Tax Year 2018 or earlier** When I report alimony payments, do I also include the portion my former spouse receives from DFAS on 1099, or only the additional amount I send via check?

My former spouse receives a total of $3400/month.  A percentage of that amount is paid directly to her from DFAS, with a 1009.  I pay the difference via personal check each month.  When I go to report alimony payments on my taxes, do I report only the total amount of the personal checks over the year and exclude the amount she gets from DFAS?