This mod let's you start a mission without a primary weapon. It will make the beginning of missions more difficult. It also reduces deployment cost. Installs via SnakeBite Mod Manager [SBWM].

Instructions: Go to select a Primary weapon. Go to the bottom of the list and select the blank choice. *Do not use on FOBs*

8/24/2017: Tested and confirmed the version 1.2 of this mod is compatible with the latest patch.
8/21/2017: 1.2 release. Removed the white square from the selection screen. Thanks Morbidslinky!
8/19/2017: 1.1 release. No longer conflicts with mods that affect EquipDevelopFlowSetting.
8/17/2017: 1.0 release. Currently conflicts with mods that make changes to 'EquipDevelopFlowSetting.lua.' I'm looking into fixing that.

Thank you to tinmantex for the help. Check out his mod Infinite Heaven. It does what this mod does, plus WAY more.
Original credit for this technique goes to unknown321.