Breaching doors in an urban environment is a difficult task for infantry units. One way the Marines have been doing it over the years is using what is known as a water charge. Basically, it's a few feet of det cord sandwiched in between two 1000ml saline IV bags. The whole mess is taped up with 100 mile an hour tape (the military version of duct tape), and then an adhesive is slapped on one side.
Det cord itself could be used, except det cord is an extremely "fast" explosive, and tends to cut, rather than push. The saline bags convert that cut into a push, excellent for removing a door. And as you can see, having a bag on both sides means it can be used in very, very close proximity to friendly personnel.
The odd mixture of uniforms and accents is because there are some foreign exchange student involved.
XBradTC 
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