Election by spouse
If—
(A) an individual is in a missing status (within the meaning of paragraph (3)) as a result of service in a combat zone (as determined for purposes of section 112), and
(B) the spouse of such individual is otherwise entitled to file a joint return for any taxable year which begins on or before the day which is 2 years after the date designated under section 112 as the date of termination of combatant activities in such zone,
then such spouse may elect under subsection (a) to file a joint return for such taxable year. With respect to service in the combat zone designated for purposes of the Vietnam conflict, such election may be made for any taxable year while an individual is in missing status.