Men and women who serve in the army can be deployed abroad for various fields of training or reserve areas, or they may even be sent for active duty to a battle zone. The commander will issue orders to provide these service personnel with all the necessary equipment and supplies.
A military medical kit is part of the official equipment that most soldiers receive, but individual soldiers may need to request specialized items or check to be sure that they have all the necessary things that may possibly be needed during a tour of duty.
Depending on other equipment needs and packaging, a medical kit might contain water purification supplies, an emetic, a blood pressure cuff, and earplugs. A gas mask could be part of the medical kit or fit with field supplies, based on its design and how the other things are packed, allowing for space and accessibility in the event the mask is needed. You can also buy military gas masks on https://www.gasmaskpro.com/gas-masks
Kits can be rearranged occasionally to help soldiers keep handy the items they are most likely to need for a particular assignment. If solder is unsure about whether to take along certain supplies, he or she should check with the medical officer.