[SalesForce] Error: Compile Error: Illegal assignment from String to Boolean

as I writing a test class, I come across this error as I am attempting to save my file.

Error: Compile Error: Illegal assignment from String to Boolean at
line 15 column 13

Are there any adjustments, I need to make to my code.

Many Thanks

@isTest 
public class ContactLookupControlTest 
{
    static testMethod void validateContactLookupControl() 
    {
            Contact c = new Contact();
            c.FirstName = 'Paul';
            c.LastName = 'Reid';
            c.MailingStreet = '205 Hill Street';
            c.MailingCity = 'Los Angeles';
            c.MailingState = 'CA';
            c.MailingPostalCode = '90015';
            c.Email = 'testingout1@aol.com';
            c.HOC__Registration_Status__c = 'Not Registered';
            c.Volunteer__c = 'FALSE';
            c.npe01__Type_of_Account__c = 'Individual';
            c.HOC__Minor_Wavier_on_File__c = 'FALSE';
            c.HOC__HOC_Domain_Name__c = 'http://operationgratitude.force.com';
            c.HOC__Disabled_Person__c = 'FALSE';
            c.HOC__Calculated_Birthdate__c = 'FALSE';
            c.HOC__Confirmed_Organizer__c = 'FALSE';
            c.HOC__Number_of_Contacts__c = '1.0';
            insert c;

            Test.StartTest(); 

                PageReference pageRef = Page.ContactLookupControl; // Add your VF page Name here
                pageRef.getParameters().put('lksrch', 'Paul');

                ContactLookupControl obj = new ContactLookupControl();
                obj.contact.FirstName ='Test';
                obj.contact.LastName ='TestLast';
                obj.saveContact();
                String str = obj.getFormTag();

            Test.StopTest();
    }
}