 Operation USA , since the early 1980s , has relied on fundraising efforts featuring singers and celebrities . These include concerts , dinners , and other events . These promotions have featured : 
 Operation USA , since the early 1980s , <a href='been_done' title='1'><mark>has</mark></a> relied on fundraising efforts featuring singers and celebrities . These include concerts , dinners , and other events . These promotions <a href='been_done' title='2'><mark>have</mark></a> featured : 
Operation USA , since da early 1980s , done relied on fundraising efforts featuring singers and celebrities . dem include concerts , dinners , and other events . Thdemromotions done featured :