Great summary, I pick out the above comment. Canadians grew to love flamethrowers, along the same timeline, and the Wasp kits were issued to all the infantry battalions for their carrier platoons in I believe October 1944. If anyone played Operation SWITCHBACK (the scenario in the old Rogue Series recently redone by Jim Stahler) or CLEARING THE BRESKENS POCKET they will recall the attack on the Leopold Canal which opened not with an artillery barrage, but a flame barrage by WASP flamethrowers.
Staff at 3rd Div. headquarters prepared a plan that would involve Wasp flamethrowers in support of the attack. Experiments demonstrated that when the reverse slope of the dike was used to angle the Wasp, the flame could reach the other side of the canal. (Divisional commander Major-General Dan) Spry decided to use this method instead of an artillery barrage in the hope of achieving both suppression and tactical surprise. He also approved the use of a sound effects troop that was to simulate the noise of bridge building and troop movement at a potential crossing point well to the east of the real objective. Those who witnessed the trials of the flamethrowers were impressed and there was some hope that the shock effect would stun the enemy during the early stages of the attack. Copp, Terry "Crossing The Leopold: Army, Part 34", Legion Magazine, January 1, 2001