"Inside of F Btry 16th Arty FDC at Quan Loi. FDC Chief Sp6 Thomas (left) and Sp4 Oosterhof (right). Our call sign was 'Niner Niner', preceded by what ever name the SSI and SOI had during that time period. I remember 'Rolling Thunder 99' and 'Package Thunder 99' as two of the call signs that we used."