St. Michael is invoked for protection, especially from lethal enemies. He is also the patron of soldiers, police and doctors. St. Michael has four main responsibilities or offices, as we know from scripture and Christian tradition. They are, to combat Satan, escort the faithful to heaven at their hour of death, to be a champion of all Christians (and the Church itself), and to call men from life on Earth to their heavenly judgment.
Wearing of the Sacred Heart Badge, has become a lost devotion. Here is a bit of history, on its inception and many proofs of its Spiritual Protection.
Our Lord revealed to St. Margaret Mary Alacoque His wish for her to order a picture of the image of His Sacred Heart for people specifically to venerate and have in their homes and also small pictures to carry with them. St. Margaret Mary always kept a Sacred Heart badge with her and inspired her novices to do the same. She made many badges and often said this practice was very pleasing to the Sacred Heart.