Pension is not to be compared with monthly maintenance as in divorce or like crpc 125.
If a armyman leaves the job and takes private job in 50's, Does that armyman lose pension?...NO...
Armyman lost life on duty and hence his half pension is applicable to wife(for rest of life) and kids as well.
But It does not deprive widow from remarrying!!!
Even after remarriage pension for the woman should continue and also for kid (based on gender) upto 18 or until one starts earning/gets married