In the old DW Q&A post, I asked if there was a bonus, besides the space wolves solo mode ability, for marines not wearing their helmets. In the RAW, there is none.
A proposed house rule:
During the oath taking portion of the mission, the squad leader may opt for a "Display of Bravery," and choose to not don his helmet this mission. Doing so increases the squad cohesion by 3 points, as his faith in the Emperor's protection increases squad morale. The helmet must not be worn for the entire mission, or else the bonus will be lost. Certain situations (such as having to walk in void) may be exempt of this requirement, as decided upon by the GM, but generally when death is a given if they do not wear the helmet.
The goal with this is to match the modeling conventions and artwork, fitting to the setting, while providing a tangible bonus to the player for doing something "dangerous." Also, it is helpful in allowing new players who have rank 1 characters (like my group, 2/3s of which haven't even played DH/RT), to be more able to experiment with squad mode. I do not think the extra cohesion will greatly unbalance the game, as it basically will allow for one or two more squad mode abilities to be used. Probably the worst thing it does is make the cohesion test easier to pass (at early game).
The negatives of the decision probably outweigh the balance issues though. Without a helmet, a squad leader is much more vulnerable enemy attacks, along with environmental hazards. Also, it will become easier for certain enemies to recognize him as the leader.
A few other possibilities is to allow this decision to give a +10/+20 command bonus (or to use that bonus what causes the cohesion bonus, and make it say +20 command/ +2 cohesion, etc.), force a negative on cohesion if the squad leader puts his helmet on (say a -1 to the max cohesion), or to give extra fate points, or perhaps that ability void born have in DH that allows FP to not be lost.
Ideas/suggestions/comments?