US marine armoured vehicles steers through the soft sand after getting off from a US Navy hovercraft during the NATO Trident Juncture exercise 2015 at Raposa Media beach in Pinheiro da Cruz, south of Lisbon, Tuesday, Oct. 20, 2015. NATO Allies and partner nations join forces for the next three weeks for the Alliance's Trident Juncture live military exercise involving 36,000 troops from more than 30 nations across Portugal, Italy and Spain. (AP Photo/Steven Governo)