Spare parts are in high demand from sanctioned countries and groups, which need them to keep old equipment up and running, according to arms control researchers. Indonesia scrambled to keep its C-130s in the air after the U.S. blocked exports for human rights violations in the 1990s. In a report on trade in arms parts, Oxfam noted that by the time of the 2011 NATO intervention in Libya, Muammar Qaddafi's air combat fleet was in dire shape, referred to by one analyst as "the world's largest military parking lot." Goodman said Congolese militia members may be using aging arms that the U.S. sold decades ago to the former Zaire.