I have no first-hand knowledge base with respect to F-15..........my only hands on experience was B-52G and U-2. Both 50s era designs but both loaded with state of the art systems. Happy days. With McDonalds and Coke being ubiquitous now I'm not sure that the catering needs for deployments are all that important these days :-) My first meal upon arriving in Saudi Arabia (during Desert Calm) was at one of 5 Pizza Hut restaurants within 10 minutes of the base where we were deployed.......no need for our own burger flippers or Coke machines. Take you point that Vulcan is redundant but it still will be missed, one of the most awesome sights/sounds that I have ever seen/heard.

Back to the OP, the 'active shooter' term is not a military term, it is an Americanism, and in the US or with American businesses considered as workplace violence, so relevant from a workplace safety perspective. Naturally this depends on location and the type of business, and should be risk assessed, some very useful links to information is already posted, and plenty of specialist companies can advise also, but only explore this if it is a real threat. I'd suggest you don't place an over reliance on a specific military background (RM/SAS), your potentially going to end up with a limited and/or very tactical response, when you may need a very broad an well rounded approach. Instead look at the previous work such a business has conducted and see if this aligns with what you need. Our landlord recently tried to update their 'incident' protocol for the business park I work at, this involving a disproportionate response to an unlikely threat, remember the legal requirement is to identify and manage foreseeable risks, we ended up ditching the landlords incident protocol as unhelpful. Working as a civilian contractor for the military in the middle east, or in a government office block in London carries a different threat level to working in an office in Liverpool or Sunderland (despite the governments issued threat levels.....)

I'm with you on your earlier response Ian, reply with a GPMG. For those who don't know, it is an air cooled, gas operated, spring assisted, disintegrating belt fed fully automatic 7.62mm calibre weapon with a range of 300 to 1800m in the light role and up to 3km in the sustained fire mode, i.e. mounted on a tripod. It has a cyclic rate of 1000 rounds a minute with normal fire being 100 rounds a minute and 200 rounds a minute being considered as rapid fire, usually in bursts of 15 to 20 rounds. Skilful operators, however, can double tap rounds. Its versatility and reliability coupled with the range of targets it has been found to be effective against (including aircraft, vehicles and personnel) make it equally suited to offensive and defensive operations and is therefore my weapon of choice. Think I'll have to go for a cold shower now.