Approximately 200,000 Vietnam veterans may soon be able to receive disability benefits for illnesses stemming from their exposure 40 years ago to Agent Orange. The Department of Veterans Affairs plans to propose this week new rules that add Parkinson’s disease, ischemic heart disease and hairy-cell leukemia to the growing list of medical problems presumptively caused by the widely-used defoliant on the jungles of Vietnam. The VA already recognizes conditions such as Hodgkin’s disease, prostate cancer and Type 2 diabetes as being caused by Agent Orange. The new rules will apply to any of the 2.1 million veterans who spent time in Vietnam during the war.