There are at least two misspellings of the word Cavalry as "Calvary" within the game. The three that I noticed immediately are:
From The Charge of the Stryker Brigade campaign description on the main menu:
Within the briefing for the mission Objective Delta from the blue side:
While I am not including an image for the red side for the mission Objective Delta, it is also misspelled as "Calvary."
There may be other locations with the misspelling in the game - it might be worth a deeper dive.
