“Drug-related illegal activity” means the illegal manufacture, sale, distribution, purchase, USE, or possession with intent to manufacture, sell distribute, or USE of a controlled substance (as defined in Section 102 or the Controlled Substance Act (21 U.S.C. 8002) or possession of drug paraphernalia.2.Resident, any member of the resident’s household or guest or other person under the resident’s control shall not engage in any act intended to facilitate illegal activity, including drug-related illegal activity, on or near the said premises.3.Resident or members of the household will not permit the dwelling to be used for, or to facilitate illegal activity, including drug-related illegal activity, regardless of whether the individual engaging in such activity is a member of the household.4.Resident or members of the household will not engage in the manufacture, sale or distribution of illegal drugs at any locations, whether on or near the dwelling unit premises, or otherwise.5.Resident, any members of the resident’s household, or a guest or other person under the resident’s control shall not engage in acts of violence, or threats of violence, including but not limited to the unlawful discharge of firearms, prostitution, criminal street gang activity, intimidation, or any other breach of the housing agreement that the other wise jeopardizes the health safety or welfare of the landlord, his agents, or tenants.6.VIOLATION OF THE ABOVE PROVISIONS SHALL BE A MATERIAL VIOLATION OF THE HOUSING AGREEMENT AND GOOD CAUSE FOR TEMINATION OF TENANCY.

The cost cuttings reductions of water usage(particularly in AZ) and central fire arms don't seem like real value plays. 

Ive never once inquired as to whether my tenants have firearms. 

---------RENTAL CRITERIAGENERAL REQUIREMENTS1.Each adult (18 years or older) must complete an application to rent and background check authorization form.2.Each applicant must provide a valid government issued picture ID at time of application. 3.Each applicant must qualify individually or together with a co-applicant as a household. 4.An application fee of$40 per application must be paid prior to processing the application.5.Occupancy is based on the number of bedrooms per unit.Maximum occupancy is two persons per bedroom.6.No Pets - no pets allowed on the premises.7.No Smoking - no smoking allowed on the premises.We will not rent to smokers.8.No Drugs - no illegal drugs are allowed on the premises.We will not rent to illegal drug users.9.No Firearms - firearms are not allowed openly on the premises.If a firearm is owned, it must be safely stored.10.We conduct full background checks.

WOW, Do you have a Crime Free/ Drug Free Addendum to your lease.What happened was a crime, discharge of a firearm in a residential unit.

He is well within his rights to ban firearms from any property he owns.

I have not had trouble with him or his relative, although his relative was convicted of possession of illegal firearms. 

Usually land that close to military base is wrought with restrictions because of live fire arms and ordinance ranges, air traffic, density regulations to handle basic utility infrastructure, etc...I love the thought process your after but sounds like it would be best left to a sophisticated investor who has experience both in development and government contracting.  

“Drug-related illegal activity” means the illegal manufacture, sale, distribution, purchase, USE, or possession with intent to manufacture, sell distribute, or USE of a controlled substance (as defined in Section 102 or the Controlled Substance Act (21 U.S.C. 8002) or possession of drug paraphernalia.2.Resident, any member of the resident’s household or guest or other person under the resident’s control shall not engage in any act intended to facilitate illegal activity, including drug-related illegal activity, on or near the said premises.3.Resident or members of the household will not permit the dwelling to be used for, or to facilitate illegal activity, including drug-related illegal activity, regardless of whether the individual engaging in such activity is a member of the household.4.Resident or members of the household will not engage in the manufacture, sale or distribution of illegal drugs at any locations, whether on or near the dwelling unit premises, or otherwise.5.Resident, any members of the resident’s household, or a guest or other person under the resident’s control shall not engage in acts of violence, or threats of violence, including but not limited to the unlawful discharge of firearms, prostitution, criminal street gang activity, intimidation, or any other breach of the housing agreement that the other wise jeopardizes the health safety or welfare of the landlord, his agents, or tenants.6.VIOLATION OF THE ABOVE PROVISIONS SHALL BE A MATERIAL VIOLATION OF THE HOUSING AGREEMENT AND GOOD CAUSE FOR TEMINATION OF TENANCY.

I'm generally better armed than the local police, but this is Texas... and I have lengthy experience with firearms.