WASHINGTON, Jun 28 (Reuters) US President Donald Trump intends to nominate Textron Systems Chief Executive Ellen Lord for the position of under secretary of defense for acquisition, technology and logistics, the White House said in a statement. Lord, who must be confirmed by the Senate, would become the Pentagon's chief weapons buyer. In May, Trump proposed a budget that would boost Pentagon spending by 52 billion dollar to 574.5 billion dollar for fiscal year 2017. Textron Systems Corp, a defense contractor, is a unit of Textron Inc. REUTERS SDR 0726