What Defense Contractors Should Be Doing Now to Prepare the Physical Side of Protecting CUI for CMMC Phase 2

As CMMC Phase 2 gets closer, many defense contractors are spending more time thinking about assessment readiness.

That is a good thing.

But one of the biggest mistakes organizations can make at this stage is focusing only on policies, documentation, and cybersecurity tools while overlooking the physical side of how Controlled Unclassified Information (CUI) is actually handled in the real world.

Because when it comes to CUI, compliance is not just about what your policy says.

It is also about what your facility communicates, what your employees see, what your visitors understand, and whether your physical environment supports the right behavior every day.

That is why now is the time for defense contractors to take a serious look at whether their physical safeguarding approach is truly assessment-ready.

Assessment Readiness Goes Beyond Written Policy

Many organizations have at least some written language around access control, media protection, visitor procedures, storage, and physical security.

But written policy alone does not create a controlled environment.

The real question is whether the physical environment itself reinforces those requirements in a way that is visible, consistent, and easy to follow.

In other words:

• Can employees quickly tell where CUI safeguards apply?
• Can visitors tell when they are entering a restricted or controlled space?
• Can staff easily distinguish CUI workstations, assets, storage points, and destruction areas?
• Does the facility reduce ambiguity, or does it rely on people just “knowing” what to do?

That distinction matters.

A policy may say that access is restricted, visitors must be escorted, paper CUI must be protected, and controlled assets must be managed. But if the physical environment does not support those expectations, the compliance gap becomes much more obvious.

That is especially important as contractors prepare for a world where physical controls may need to be demonstrated more clearly and supported more consistently.

1. Controlled Environment Identification

One of the first things contractors should evaluate is whether the rooms, spaces, and environments where CUI is handled are clearly identified.

This seems simple, but it is one of the most important parts of physical CUI safeguarding.

If your organization cannot clearly identify where CUI is created, viewed, discussed, printed, stored, or destroyed, it becomes much harder to prove that those environments are actually controlled.

Many organizations have areas that are functionally treated as sensitive but not physically defined that way. A team may know that a particular engineering office handles CUI. A program manager may know that certain records cabinets contain controlled information. A department may know that one printer is commonly used for sensitive documents.

But informal understanding is not the same as operational clarity.

Controlled environment identification should answer questions like:

• Which rooms or spaces are used for CUI handling?
• Are those areas visibly distinguishable from non-CUI environments?
• Would a new employee know that additional safeguards apply there?
• Would a visitor know they should not enter freely?

The more clearly a contractor defines these spaces, the easier it becomes to create consistent behavior around them.

2. Entry Point and Access Signage

Once controlled areas are identified, the next question is whether entry points and boundaries are clearly communicated.

Doors, access points, internal boundaries, and room entrances are all moments where the environment should help people make the right decision.

This matters because compliance often breaks down at transition points.

Someone walks into a room they should not enter.
A visitor follows an employee into a restricted area.
A contractor or temporary worker enters a space without realizing it has additional handling requirements.
An employee who does not regularly work with CUI crosses a boundary without thinking about it.

That is why entry point and access signage is so important.

Good signage does not just decorate a door. It provides immediate clarity.

It tells employees and visitors:

• this space has restrictions,
• authorization matters here,
• different handling expectations apply,
• access may be limited,
• and entry is not casual.

For many organizations, this is one of the easiest ways to strengthen the physical side of compliance quickly. Clear signage creates visible structure where ambiguity used to exist.

3. Workstation and Device Marking

Defense contractors should also review whether the systems, devices, and assets used for CUI are clearly distinguishable.

This is another area where assumptions often create risk.

A company may know that only certain computers are authorized for CUI processing. The IT team may know it. The security team may know it. Some end users may know it.

But if those devices are not clearly marked, then the environment depends too heavily on memory.

That creates avoidable confusion.

Employees should not have to guess:

• which workstation is approved for CUI,
• which printer is used for controlled documents,
• which removable media devices are authorized,
• or which equipment falls within a controlled handling process.

Marking workstations and devices supports compliance in a very practical way. It helps reduce accidental misuse, reinforces handling expectations, and makes the environment easier to understand at a glance.

When the physical environment clearly identifies controlled assets, organizations are less dependent on verbal reminders and much more likely to operate consistently.

4. Paper CUI Handling

Paper CUI is one of the most overlooked parts of many compliance environments.

That is often because organizations think about CUI primarily in digital terms. But in many facilities, some of the most visible risks involve printed material.

Engineering drawings.
Program documents.
Quality records.
Technical instructions.
Temporary working copies.
Meeting materials.
Printed emails or reference packets.

Once CUI exists in paper form, the physical environment plays a huge role in whether it is safeguarded correctly.

Contractors should be looking closely at questions like:

• Are printed materials clearly marked?
• Are coversheets being used where appropriate?
• Is paper CUI separated from general paperwork?
• Is it left in the open on desks, printers, or shared work surfaces?
• Is there a clear expectation for how it should be handled when not actively in use?

Paper handling is where many organizations discover that written policy is not enough. Employees need visible cues and repeatable habits. The easier it is to identify sensitive material, the easier it is to protect it.

5. Storage Controls

Another major review area is storage.

If CUI is being kept in filing cabinets, drawers, bins, shelves, folders, storage rooms, or other designated locations, those storage points should be evaluated carefully.

The key issue is not just whether CUI is stored somewhere.

It is whether storage is controlled in a way that supports proper identification and handling.

Questions worth asking include:

• Are storage locations containing CUI clearly identifiable?
• Are those locations accessible only to the right people?
• Are drawers, cabinets, and bins organized in a way that reduces accidental exposure?
• Could an employee, visitor, or contractor mistakenly access or mishandle stored material?

Storage controls matter because they often represent the “resting state” of CUI. Even if your active handling process is strong, weak storage practices can undermine the whole system.

Clear storage identification and control help ensure that CUI remains protected when it is not actively being worked on.

6. Visitor Procedures

Visitor control is one of the most visible indicators of whether a physical CUI environment is functioning well.

Most organizations have some kind of visitor policy. But the real issue is whether the environment makes those expectations easy to enforce.

For example:

• Are visitors visibly distinguishable from employees?
• Is it obvious where visitors can and cannot go?
• Are escort expectations clear?
• Are employees likely to intervene if a visitor is seen in the wrong place?
• Does the environment itself reinforce restricted access?

Visitor procedures work best when they are not dependent on everyone remembering every rule at every moment. Visual cues matter.

Badges matter.
Signs matter.
Boundaries matter.
Check-in expectations matter.

When those things are missing, visitor control becomes inconsistent. And inconsistent visitor control can create major physical safeguarding gaps.

7. Destruction Workflows

Approved destruction is another area contractors should be reviewing now.

A surprising number of companies have a general understanding that CUI must be properly destroyed, but the actual workflow around destruction is weak.

Employees may not know:

• where controlled materials should be discarded,
• which bins are approved,
• whether shredding requirements differ from normal disposal,
• or how to handle temporary papers, notes, labels, and other work products containing CUI.

That uncertainty leads to mistakes.

A strong destruction workflow should be visible and easy to follow. Employees should not have to guess where sensitive paper goes, whether a destruction container is approved, or what disposal process applies.

This is one of those areas where physical controls can dramatically improve consistency. Clearly designated destruction points and visible support for the process reduce the risk of improper disposal.

8. Alternate Worksite Safeguards

If a contractor allows CUI handling outside the primary facility, that issue needs to be be reviewed very carefully.

This is where many organizations discover that their physical safeguards are too facility-centric.

A company may have a decent in-office setup but very little clarity around what physical expectations apply in alternate work locations. That can include satellite spaces, remote environments, home offices, temporary project locations, or other off-site work areas.

The question is not just whether remote work is allowed.

The question is whether the physical side of that work has been clearly thought through.

For example:

• Where can paper CUI be stored?
• How is it protected from family members, roommates, visitors, or other unauthorized individuals?
• Are there clear expectations around printing, storage, and disposal?
• Are authorized devices and materials handled differently from general household or personal items?

If alternate worksite safeguards are vague, the organization may have a major exposure point even if its main facility is well controlled.

Why This Matters for Contract Readiness

The biggest takeaway is simple:

CMMC Phase 2 raises the business importance of physical CUI safeguarding.

For applicable contractors, physical compliance is no longer something that can sit quietly in the background. It becomes part of readiness. Part of defensibility. Part of how the organization supports its claim that it protects CUI appropriately.

And in many cases, physical weaknesses are easier to spot than cyber weaknesses.

A missing sign is easy to notice.
An unmarked workstation is easy to notice.
A visitor in the wrong area is easy to notice.
Paper CUI left in the open is easy to notice.
An uncontrolled cabinet or unclear boundary is easy to notice.

That means physical gaps can create outsized risk.

An organization may have strong intent, strong leadership, and strong documentation. But if the physical environment does not reinforce those controls, that disconnect becomes much more important when scrutiny increases.

Final Thought

Defense contractors preparing for CMMC Phase 2 should not wait until the last minute to evaluate the physical side of their environment.

Now is the time to walk the facility, examine workflows, identify ambiguity, and ask whether the environment itself supports compliant behavior.

Because in the end, physical safeguarding is not just about having rules.

It is about creating an environment where the right actions are obvious, repeatable, and defensible.

That is what assessment-ready physical CUI protection looks like.