Now this is pretty generic info pulled from the Recruiting site at www.forces.ca/v3/engraph/home/home.aspx?bhcp=1 , hope it helps.
ARMY
COMBAT ENGINEER
Your job is to ensure that friendly troops can live, move and fight on the battlefield, and deny the same abilities to enemy troops.
WHAT THEY DO
Combat Engineers are members of the Military Engineer branch of the Canadian Forces. Their job is to ensure that friendly troops can live, move and fight on the battlefield, and deny the same abilities to enemy troops. They also perform duties in aid of the civil power and civil authority; participate in peace-support operations; perform construction and maintenance tasks in support of the CF and other government organizations; drive and operate vehicles and equipment in support of Engineer Operations; and maintain field installations and facilities.
Combat Engineers have the following primary duties:
Construct and maintain roads, airfields, heliports, bridges, causeways, rafts, permanent and temporary buildings;
Construct field defences and obstacles;
Provide drinking water by testing, purifying and filtering local supplies and by constructing local distribution systems;
Detect and dispose of mines, booby traps and bulk explosives;
Deny mobility to the enemy on the battlefield by demolishing roads and bridges, and laying minefields and booby traps;
Maintain and operate engineering equipment, including weapons, vehicles, heavy equipment and supplies;
Provide engineer communications on the battlefield; and
When necessary, fight as infantry (includes use of personal weapons, reconnaissance and section-level tactics).
AIR FORCE
CONSTRUCTION TECHNNICIAN
You will provide structural engineering support to operational units at home and abroad. You will construct, repair and maintain buildings for the protection of personnel and equipment, produce related structural drawings and construct field defenses.
WHAT THEY DO
The Construction Technician (CONST TECH) provides structural engineering support to operational units at home and abroad. During peacetime, CONST TECHs maintain their skills while employed at home units or on humanitarian and United Nations operational assignments. The CONST TECH occupation is one of seven Construction Engineering occupations involved in the supply of all construction, civil, electrical and mechanical engineering services in support of Canadian Forces operations worldwide.
Construct, repair and maintain buildings for the protection of personnel and equipment
Produce related structural designs and specifications
Produce related structural drawings
Construct field defenses
Harden field structures
Erect prefabricated structures
Conduct reconnaissance related to the above
Assist other Construction Engineering tradespersons