(a) In the case of a member whose coverage is forfeited under 38 U.S.C. 1973, coverage terminates at the end of the day preceding the day on which the act or omission forming the basis for such forfeiture occurred.

(b) In the event of discontinuance of the group policy, coverage terminates at the end of the day preceding the date of the discontinuance of the policy except for those members who are insured under Veterans' Group Life Insurance in which event coverage terminates at the expiration of the day preceding the anniversary of the effective date of such insurance which first occurs, 90 days or more after the discontinuance of the group policy.