I can't find the exact place I saw it originally, but there are various places claiming someone said it without saying who or giving a direct quote...
https://www.independent.co.uk/news/congress-army-donald-trump-washington-national-mall-b2763981.html
https://www.independent.co.uk/news/congress-army-donald-trump-washington-national-mall-b2763981.html
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Driscoll replied that he thinks the parade offers a chance to tell the public about the Army. “I believe very specifically that telling that story will directly lead to a recruiting boom and will fill up our pipeline for the coming years," he said.