Sigillum militum Xpisti Latin (i.e. Sigillum militum Xpisti) is translated to Seal of the Soldiers/Army of Christ The X in Greek is the CH ... and the P (or Ro) is the R. The Seal of the Soldier of Christ
Deus vult (Ecclesiastical Latin: 'God wills it') is a Christian motto relating to Divine providence. It was first chanted by Catholics during the First Crusade in 1096 as a rallying cry, most likely under the form Deus le veult or Deus lo vult, as reported by the Gesta Francorum (ca. 1100) and the Historia Belli Sacri (ca. 1130). In modern times, the Latin motto has different meanings depending on the context. It has been used as a metaphor referring to "God's will" by Christians throughout history, such as the Puritans, or as a motto by chivalric orders such as the Equestrian Order of the Holy Sepulchre of Jerusalem.
