Call to Battle

No, because Call to Battle requires the player to choose the move destination, so the restriction on valid destinations applies directly.

When a spell or ability has the player choose a move destination, that destination must be somewhere other than the unit's current location.^{[355.4][355.4.a]} Call to Battle has the player choose both the unit and the battlefield, so the chosen battlefield cannot be the unit's current location. If no valid destination can be chosen for the selected unit, the spell cannot be finalized.

This contrasts with Flash, which specifies its destination — base — rather than requiring the player to choose one. Because no destination choice is made when playing Flash, this restriction never applies, and a unit already in base is a valid target.