In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].

Example input: For four years we have waited expectantly for the pitter patter of tiny paws. Soon, that wait could finally be over. Tian Tian, the UK's only female giant panda, has conceived and could give birth to a cub as early as August. However Edinburgh Zoo, where the pandas live, have warned people 'not to get too excited' as the process is 'extremely complex'. Moreover, on the two previous occasions keepers inseminated Tian Tian - whose name means 'Sweetie' - she has failed to produce a panda cub. She was artificially inseminated again in March this year, but keepers at the zoo say implantation - when a fertilised egg attaches to the uterus - has not yet occurred.Tian Tian has conceived and could give birth to a cub as early as AugustShe has been inseminated twice before but so far failed to produce a cubTian Tian and Yang Guang arrived in 2011 from China to great fanfareOn loan at £600k a year, became first giant pandas to live in UK for 17 years 
 Questions:Under the terms of the agreement any cubs will return to _ at the age of two, the age at which they would normally leave their mother in the wild.
Example output: China
Example explanation: This is a good example. Based on the passage, any cubs will return to China at the age of two
Q: (CNN) The Marine Corps' fighting ability is undermined by the more than 30,000 active Marines and veterans involved in a private Facebook group being investigated for allegedly posting explicit photos of women in the military without their consent, a former Navy secretary told CNN on Friday. "There's no good excuse," Ray Mabus said on CNN's New Day. "The Marine motto is 'semper fidelis,' always faithful, and what these Marines did was to be unfaithful to their fellow Marines." "Marines look after each other, Marines have each other's back. Look at what the commandant of the Marine Corps said about this, this makes us a less effective fighting force," Mabus said, referring to a video statement posted Tuesday by Gen. Robert Neller.Ray Mabus: "What these Marines did was to be unfaithful to their fellow Marines"Investigation should determine how "Marines United" group developed, he said 
 Question:"These Marines, these veterans, that have participated in this have attacked fellow _, and that is inexcusable in a fighting force, and particularly in the Marines, who are so special."
A:
Marines