Mindef Aviva Group Personal Accident Insurance

Any parents here purchase Mindef Aviva Group Personal Accident insurance for yourself and your dependants through your Hubby? Note: This can only be bought if Hubby has served Singapore National Service before. It's cheap at $1 per month for $100,000 coverage per person, and we can buy same coverage at this discounted price for our wife and children. Details here: https://www.aviva.com.sg/en/mindef-and-mha/group-personal-accident/ However when I explore further, the Mindef Aviva group personal Accident insurance does not cover events such as Food Posioning and Hand food mouth disease yet. Not sure if it's possible to add on coverage for Food Posioning and HFMD etc? Also curious to know what personal accident insurance do parents in this community buy for yourself and or your dependants?