1 Engine company with 3 personnel isn't going to break the 2 in 2 out rule. You have other companies coming. So, again read the actual standards. If you don't have the standards. I can email them to you. My volunteer department has failed an ISO inspection before for not having 2 engines and 4 personnel on scene in the past. The city adjacent to my volunteer department operates 3 personnel on all their trucks because 2 engines still provide 6 personnel on scene. Therefore, the "two in two out" is still accomplished. Read the standards, not just an article from NOFD's IAFF.
Um it does violate the regulations because if it's a structure fire you are responding to then the two in two out applies read the standards then come back here and start talking I know the regulations i don't need a volunteer telling a career what is and what isn't regulation. Trucks are meant to have 3 personnel we are talking about engine companies not truck companies. Let me tell you something go ahead and read OSHA and NFPA then come back here and start talking volunteer boy lol not meant to bash on volunteers. the two in two out applies to attack crews and guess who does the attacking engines so no that part about saying 6 personnel on scene does not apply it applies to engines because they are the ones attacking the fire in a structure so therefore it applies onl to them so therefore you just admitted another department is breaking industry standards.