You would report that as pension but PS may not play nice without EIN.  You could refer to this post for a workaround but YMMV: https://proconnect.intuit.com/community/proseries-tax-discussions/discussion/re-reporting-pension/01...

My understanding is that NATO would provide partial reimbursements for tax incurred on pension alone without accounting for other income.  That's something to keep in mind but it's unlikely to impact this year's return so long as the claim can only be submitted after the fact.