Spending over 200 days in combat, the 105th Engineer Combat Battalion brought honor and true meaning to its motto "Ever Dependable."

source: http://www.105th.org/history.html

The motto of the 538th Engineer Battalion (Construction) is "Nil Ardui Est" which means "No Height is too Ardous."
source: http://www.nadara.com/538th/538unitinsignia.html

The motto of the 588th Engineer Battalion is "HIC ET UBIQUE" (Here and Everywhere).
source: http://www.mendonet.com/588th/#crest

The motto of the 104th Engineer Battalion is "Faciendum Est". The motto means in plain English "IT MUST BE DONE", indicating that engineers never shirk a job, no matter how hard or seemingly impossible it is.
source: http://members.tripod.com/~EngrAssoc/dui.html

The motto of the 27th Engineer Battalion (Combat) (Airborne) is OMNES RES BENE FACERE which in ENGLISH means "To do all things well"
source: http://www.bragg.army.mil/27eng/bn%2..._symbolism.htm

The motto of the 84TH ENGINEER BATTALION is "Never Daunted"
source: http://84thengineers.com/pictures/history/crest.htm

The motto of the 86th Engineer Bn is Pontifices Sumus (We are Builders of Bridges).
source: http://members.tripod.com/flavets/lineage.htm

I've deleted some of your Engineer threads and added them here now.
I't a bit easier to find the mottos if you use just one thread.

Also got several of the engineer mottos listed on the site already:
http://www.military-quotes.com/mottos/engineer.htm