[(Were you)/(Was he/she)] on active duty in Vietnam, Laos, or Cambodia; in the waters in or around these countries, or did you fly missions over these areas at any time between February 28, 1961 and August 4, 1964?
(D) Don't know (Blind)
(R) Refused (Blind)
If any PEAFWHN1-4=1 goto S1a1
Else If any PEAFWHN1-4=2 goto S1b
Else goto S4