I have seen recruiting band/sport forms that have that "role" field. On the band, could be if you play something or would be a singer, in sports (i.e. Soccer) - the position in which you have skills to play.
This re-enactment event wants to know what role you want to play, so it´s about 'acting" here.http://www.royalscotsgrenadiers.com/recruiting.html
Usually, to seek a job, I think some field on a recruiting form would have the word "application". For example "applying for position". And then, if an online form, it would have a drop-down list to choose the position of choice.