Noun and する verb
じゅんれい
世界中の聖地を巡礼しようと決心しました。
I’ve decided to go on a pilgrimage to sacred places around the world.
A patrol of thanks is a patrol you make to something you're thanking. Sounds religious. Sounds like a pilgrimage.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.