Is a drip edge recommended for a new roof?

We're getting bids to put on a new roof and getting conflicting info. Some say a drip edge is needed, others say not. From what I see, we currently do NOT have a drip edge on the eaves or rake (I posted a few photos below. Ignore the other pics posted in that area. Those were used for another post and are the reason why we're getting a new roof. There are two pics of the eave and one of the rake). Rake1 Photo by hikerguy1 | Photobucket (http://s1098.photobucket.com/user/hikerguy1/media/HOUSE/20150513_132649_zpsrxuj6n94.jpg.html) If we're putting up a new roof, should we have them put up a drip edge as well? Thanks, Andy