For years, the standard requirement for police officers across the country for first aid training was the basic course provided by the American Red Cross. In fact, in some places that's still the only requirement—a problem that requires further attention (and funding appropriation) by administrators and trainers before it is fully resolved.
However, agencies nowadays—for the most part, anyway—provide officers with much more than this minimum of training and equipment.
For example, there is a greater focus on hemorrhage control because agencies now recognize how important it is to staunch any heavy bleeding the first few moments after a traumatic injury—this was highlighted just a few weeks ago
in this space
.
Many officers are now outfitted with (and trained on the use of) Individual First Aid Kits (IFAKs) containing a tourniquet, packing gauze, pressure dressings, bandages, rescue shears, hypothermia wrap ("space" blanket), hemostatic agent (QuickClot), and some simple wound cleaning agents such as saline or an over-the-counter antimicrobial.
Officers should be given ample time to familiarize themselves with how to use each of these pieces of equipment. There are a number of training tools available with which officers can practice. CPR manikin kits (adult and child size) are practically a must. Most academies have "blue trainer" tourniquets—many individual officers even have their own.