Washington - President Donald Trump has signed an order to begin what he called a "great rebuilding" of the US armed services, promising new aircraft, naval ships and more resources for the military."Our military strength will be questioned by no one, but neither will our dedication to peace. We do want peace," Trump said in a ceremony at the Pentagon.Trump predicted that Congress, which sets the expenditures for the government, will "be very happy to see" the White House's new spending request for the military.Hiring freezeTrump made clear during last year's presidential campaign and in recent weeks that he wants to enlarge the ranks of the military services and expand its fleets of aircraft and ships.For example, he said he envisioned a naval fleet of 350 vessels, up from the navy's current 274 and more than its 310 vessel target. And Trump excluded the military from a hiring freeze across the rest of the government that he ordered just after being inaugurated president on January 20.He is also expected to order his new defence secretary, James Mattis, to intensify operations against the Islamic State group in Iraq and Syria with more US soldiers and military hardware like artillery and attack helicopters.Another expected move is to review and the strengthen the country's ability to defend itself against cyber attacks and to conduct offensive cyber attacks itself.The order Trump signed was less specific, calling for a sweeping 30-day readiness review of the US military, with the aim of preparing new budget requests to improve readiness.But he has also pressured the Pentagon to cut costs on some of its most expensive programmes.Reduce costEarlier, Mattis ordered financial reviews of the costs of two major defence programmes - the $400bn F-35 fighter jet project and the $4bn development of a new Air Force One presidential jet. Trump had complained that both were too costly.The Pentagon needs to find ways "to significantly reduce the cost" of the F-35 programme, Mattis said, even weighing the competitiveness of the rival F-18.The F-35 is built by Lockheed Martin, while the F-18 is built by Boeing.