You need to let us know right away if you can't make the appointment.  You can likely reschedule but that may delay your claim
How can I find out whether I'm eligible for disability benefits?
You may also qualify for disability benefits if you served in at least one of the below locations and capacities .s   [22] You were:s   [23] Part of underground nuclear weapons testing at Amchitka Island , Alaska?
Is there a number to call for more information?