Below is what the law states on the matter. From my read, if you had a car accidenct on the way home from drill that was not due to gross negligence, it would be compensable under the IDES. If you had a heart attack on the drive home, it would be compensable as well. As heart condition, it might be a little more tricky. Is there heart damage suffered while on drill/driving to/from drill that causes you to be unfit? Or, is it a long running condition not specifically tied to drill duty? Regardless, they need to determine if your reserve duty, or previous active duty stint, permanently aggravated the condition. Another possibility is a presumptive condition tied to your active duty service in the gulf. If it can be detrmine the condition began while on active duty that would make it compensable as well.
From 10 USC 1204:
Upon a determination by the Secretary concerned that a member of the armed forces not covered by section
1201,
1202, or
1203 of this title is unfit to perform the duties of his office, grade, rank, or rating because of physical disability, the Secretary may retire the member with retired pay computed under section
1401 of this title, if the Secretary also determines that—
(1)based upon accepted medical principles, the disability is of a permanent nature and stable;
(2)the disability—
(A)was incurred before September 24, 1996, as the proximate result of—
(i)performing active duty or inactive-duty training;
(ii)traveling directly to or from the place at which such duty is performed; or
(iii)an injury, illness, or disease incurred or aggravated while remaining overnight, immediately before the commencement of inactive-duty training, or while remaining overnight between successive periods of inactive-duty training, at or in the vicinity of the site of the inactive-duty training, if the site of the inactive-duty training is outside reasonable commuting distance of the member’s residence;
(
B)is a result of an injury, illness, or disease incurred or aggravated in line of duty after September 23, 1996—
(i)while performing active duty or inactive-duty training;
(ii)while traveling directly to or from the place at which such duty is performed; or
(iii)while remaining overnight, immediately before the commencement of inactive-duty training, or while remaining overnight between successive periods of inactive-duty training, at or in the vicinity of the site of the inactive-duty training; or
(C)is a result of an injury, illness, or disease incurred or aggravated in line of duty—
(i)while the member was serving on funeral honors duty under section
12503 of this title or section
115 of title
32;
(ii)while the member was traveling to or from the place at which the member was to so serve; or
(iii)while the member remained overnight at or in the vicinity of that place immediately before so serving, if the place is outside reasonable commuting distance from the member’s residence;
(3)the disability is not the result of the member’s intentional misconduct or willful neglect, and was not incurred during a period of unauthorized absence; and
(4)either—
(A)the member has at least 20 years of service computed under section
1208 of this title; or
(B)the disability is at least 30 percent under the standard schedule of rating disabilities in use by the Department of Veterans Affairs at the time of the determination.